diff --git a/gradle.properties b/gradle.properties
index 2aa3ba2..f60dbd3 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -2,7 +2,7 @@ kotlin.code.style=official
 org.gradle.jvmargs=-Xmx2048M -Dfile.encoding=UTF-8
 
 group=net.projecttl
-version=0.2.3-SNAPSHOT
+version=0.3.0-SNAPSHOT
 
 ktor_version=2.3.12
 log4j_version=2.23.1
diff --git a/px32-bot-api/src/main/kotlin/net/projecttl/p/x32/api/BotConfig.kt b/px32-bot-api/src/main/kotlin/net/projecttl/p/x32/api/BotConfig.kt
new file mode 100644
index 0000000..dbd9bb9
--- /dev/null
+++ b/px32-bot-api/src/main/kotlin/net/projecttl/p/x32/api/BotConfig.kt
@@ -0,0 +1,70 @@
+package net.projecttl.p.x32.api
+
+import org.jetbrains.exposed.sql.Database
+import java.io.File
+import java.io.FileInputStream
+import java.util.*
+import kotlin.reflect.KProperty
+import kotlin.system.exitProcess
+
+object BotConfig {
+	private fun useBotConfig(): BotConfigDelegate {
+		return BotConfigDelegate()
+	}
+
+	fun useDatabase(): Database {
+		if (db_username.isNotBlank() && db_password.isNotBlank()) {
+			return Database.connect(
+				driver = db_driver,
+				url = db_url,
+				user = db_username,
+				password = db_password
+			)
+		}
+
+		return Database.connect(
+			driver = db_driver,
+			url = db_url
+		)
+	}
+
+	val token: String by useBotConfig()
+	val owner: String by useBotConfig()
+
+	private val bundle_func: String by useBotConfig()
+	val bundle = when (bundle_func) {
+		"1"  -> true
+		"0"  -> false
+		else -> {
+			throw IllegalArgumentException("bundle_func option must be 0 or 1")
+		}
+	}
+
+	private val db_driver: String by useBotConfig()
+	private val db_url: String by useBotConfig()
+	private val db_username: String by useBotConfig()
+	private val db_password: String by useBotConfig()
+}
+
+private class BotConfigDelegate {
+	private val props = Properties()
+
+	init {
+		val file = File("config.properties")
+		if (!file.exists()) {
+			val default = this.javaClass.getResourceAsStream("/config.sample.properties")!!.readBytes()
+			file.outputStream().use { stream ->
+				stream.write(default)
+			}
+
+			println("config.properties is not found, create new one...")
+			exitProcess(1)
+		}
+
+		props.load(FileInputStream(file))
+	}
+
+	operator fun getValue(thisRef: Any?, property: KProperty<*>): String {
+		return props.getProperty(property.name).toString()
+	}
+}
diff --git a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/Px32.kt b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/Px32.kt
index a747ae0..595c921 100644
--- a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/Px32.kt
+++ b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/Px32.kt
@@ -7,28 +7,28 @@ import net.dv8tion.jda.api.JDA
 import net.projecttl.p.x32.command.Info
 import net.projecttl.p.x32.command.PluginCommand
 import net.projecttl.p.x32.command.Reload
-import net.projecttl.p.x32.config.Config
+import net.projecttl.p.x32.api.BotConfig
 import net.projecttl.p.x32.config.DefaultConfig
 import net.projecttl.p.x32.kernel.CoreKernel
-import org.jetbrains.exposed.sql.Database
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
 
 lateinit var jda: JDA
+	private set
 lateinit var kernel: CoreKernel
-lateinit var database: Database
+	private set
 
 val logger: Logger = LoggerFactory.getLogger(Px32::class.java)
 
 @OptIn(DelicateCoroutinesApi::class)
 fun main() {
 	println("Px32 version v${DefaultConfig.version}")
-	if (Config.owner.isBlank() || Config.owner.isEmpty()) {
+	if (BotConfig.owner.isBlank() || BotConfig.owner.isEmpty()) {
 		logger.warn("owner option is blank or empty!")
 	}
 
-	kernel = CoreKernel(Config.token)
-	val handler = kernel.getCommandContainer()
+	kernel = CoreKernel(BotConfig.token)
+	val handler = kernel.commandContainer
 
 	handler.addCommand(Info)
 	handler.addCommand(Reload)
diff --git a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/Info.kt b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/Info.kt
index b197a42..b921c48 100644
--- a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/Info.kt
+++ b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/Info.kt
@@ -6,7 +6,7 @@ import net.dv8tion.jda.api.interactions.commands.build.CommandData
 import net.dv8tion.jda.internal.interactions.CommandDataImpl
 import net.projecttl.p.x32.api.command.GlobalCommand
 import net.projecttl.p.x32.config.DefaultConfig
-import net.projecttl.p.x32.kernel.CoreKernel.PluginLoader
+import net.projecttl.p.x32.kernel
 import java.lang.management.ManagementFactory
 
 object Info : GlobalCommand {
@@ -18,7 +18,8 @@ object Info : GlobalCommand {
 		val rb = ManagementFactory.getRuntimeMXBean()
 		val r = Runtime.getRuntime()
 
-		val size = PluginLoader.getPlugins().size
+		val size = kernel.plugins.size
+		val hSize = kernel.handlers.size
 
 		val info = """
 			Px32Bot v${DefaultConfig.version}, JDA `v${JDAInfo.VERSION}`,
@@ -30,7 +31,8 @@ object Info : GlobalCommand {
 			Assigned `${r.maxMemory() / 1048576}MB` of Max Memories at this Bot
 			Using `${(r.totalMemory() - r.freeMemory()) / 1048576}MB` at this Bot
 			
-			Total $size plugin${if (size > 1) "s" else ""} loaded 
+			Total $size plugin${if (size > 1) "s" else ""} loaded
+			Total $hSize handler${if (hSize > 1) "s" else ""} used
         """.trimIndent()
 
 		ev.reply(info).queue()
diff --git a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/PluginCommand.kt b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/PluginCommand.kt
index 370f57b..2af47c7 100644
--- a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/PluginCommand.kt
+++ b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/PluginCommand.kt
@@ -8,10 +8,10 @@ import net.dv8tion.jda.internal.interactions.CommandDataImpl
 import net.projecttl.p.x32.api.command.GlobalCommand
 import net.projecttl.p.x32.api.util.colour
 import net.projecttl.p.x32.api.util.footer
-import net.projecttl.p.x32.kernel.CoreKernel.PluginLoader
+import net.projecttl.p.x32.kernel
 
 object PluginCommand : GlobalCommand {
-	override val data = CommandData.fromData(CommandDataImpl("plugin", "봇에 불러온 플러그인을 확인 합니다").toData())
+	override val data = CommandData.fromData(CommandDataImpl("plugins", "봇에 불러온 플러그인을 확인 합니다").toData())
 
 	override suspend fun execute(ev: SlashCommandInteractionEvent) {
 		val embed = EmbedBuilder().apply {
@@ -22,7 +22,7 @@ object PluginCommand : GlobalCommand {
 			footer(ev.user)
 		}
 
-		val loader = PluginLoader.getPlugins()
+		val loader = kernel.plugins
 		val fields = loader.map { (c, _) ->
 			MessageEmbed.Field(":electric_plug: **${c.name}**", "`${c.version}`", true)
 		}
diff --git a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/Reload.kt b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/Reload.kt
index 2d82c1f..991f5cc 100644
--- a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/Reload.kt
+++ b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/command/Reload.kt
@@ -4,7 +4,7 @@ import net.dv8tion.jda.api.events.interaction.command.SlashCommandInteractionEve
 import net.dv8tion.jda.api.interactions.commands.build.CommandData
 import net.dv8tion.jda.internal.interactions.CommandDataImpl
 import net.projecttl.p.x32.api.command.GlobalCommand
-import net.projecttl.p.x32.config.Config
+import net.projecttl.p.x32.api.BotConfig
 import net.projecttl.p.x32.kernel
 
 object Reload : GlobalCommand {
@@ -15,7 +15,7 @@ object Reload : GlobalCommand {
 			return
 		}
 
-		if (ev.user.id != Config.owner) {
+		if (ev.user.id != BotConfig.owner) {
 			return ev.reply(":warning: 권한을 가지고 있지 않아요").queue()
 		}
 
diff --git a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/config/Config.kt b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/config/Config.kt
deleted file mode 100644
index 5cacf94..0000000
--- a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/config/Config.kt
+++ /dev/null
@@ -1,48 +0,0 @@
-package net.projecttl.p.x32.config
-
-import net.projecttl.p.x32.logger
-import java.io.File
-import java.io.FileInputStream
-import java.util.*
-import kotlin.reflect.KProperty
-import kotlin.system.exitProcess
-
-object Config {
-	private fun useConfig(): ConfigDelegate {
-		return ConfigDelegate()
-	}
-
-	val token: String by useConfig()
-	val owner: String by useConfig()
-
-	private val bundle_func: String by useConfig()
-	val bundle = if (bundle_func == "1") true else if (bundle_func == "0") false else throw IllegalArgumentException("bundle_func option must be 0 or 1")
-
-	val db_driver: String by useConfig()
-	val db_url: String by useConfig()
-	val db_username: String by useConfig()
-	val db_password: String by useConfig()
-}
-
-private class ConfigDelegate {
-	private val props = Properties()
-
-	init {
-		val file = File("config.properties")
-		if (!file.exists()) {
-			val default = this.javaClass.getResourceAsStream("/config.sample.properties")!!.readBytes()
-			file.outputStream().use { stream ->
-				stream.write(default)
-			}
-
-			logger.error("config.properties is not found, create new one...")
-			exitProcess(1)
-		}
-
-		props.load(FileInputStream(file))
-	}
-
-	operator fun getValue(thisRef: Any?, property: KProperty<*>): String {
-		return props.getProperty(property.name).toString()
-	}
-}
\ No newline at end of file
diff --git a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/kernel/CoreKernel.kt b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/kernel/CoreKernel.kt
index 40ce0bc..d6f1d30 100644
--- a/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/kernel/CoreKernel.kt
+++ b/px32-bot-core/src/main/kotlin/net/projecttl/p/x32/kernel/CoreKernel.kt
@@ -7,10 +7,11 @@ import net.dv8tion.jda.api.JDABuilder
 import net.dv8tion.jda.api.hooks.ListenerAdapter
 import net.dv8tion.jda.api.requests.GatewayIntent
 import net.dv8tion.jda.api.utils.MemberCachePolicy
+import net.projecttl.p.x32.api.BotConfig
 import net.projecttl.p.x32.api.Plugin
 import net.projecttl.p.x32.api.command.CommandHandler
 import net.projecttl.p.x32.api.model.PluginConfig
-import net.projecttl.p.x32.config.Config
+import net.projecttl.p.x32.config.DefaultConfig
 import net.projecttl.p.x32.func.BundleModule
 import net.projecttl.p.x32.logger
 import java.io.File
@@ -19,6 +20,9 @@ import java.nio.charset.Charset
 import java.util.jar.JarFile
 
 class CoreKernel(token: String) {
+	lateinit var jda: JDA
+		private set
+
 	private val builder = JDABuilder.createDefault(token, listOf(
 		GatewayIntent.GUILD_PRESENCES,
 		GatewayIntent.GUILD_MEMBERS,
@@ -28,189 +32,202 @@ class CoreKernel(token: String) {
 		GatewayIntent.GUILD_EMOJIS_AND_STICKERS,
 		GatewayIntent.SCHEDULED_EVENTS
 	)).setMemberCachePolicy(MemberCachePolicy.ALL)
-	private val handlers = mutableListOf<ListenerAdapter>()
-	private val commandContainer = CommandHandler()
 
 	val memLock = Mutex()
-	val plugins get() = PluginLoader.getPlugins().map { it.value }
+	val commandContainer = CommandHandler()
+	val plugins = mutableMapOf<PluginConfig, Plugin>()
+	var isActive = false
+		private set
 
-	private fun include() {
-		if (Config.bundle) {
-			val b = BundleModule()
-			PluginLoader.putModule(b.config, b)
+	private val parentDir = File("./plugins").apply {
+		if (!exists()) {
+			mkdirs()
 		}
 	}
 
-	fun getCommandContainer(): CommandHandler {
-		return commandContainer
+	val handlers: List<ListenerAdapter>
+		get() {
+		if (!isActive) {
+			return listOf()
+		}
+
+		return jda.eventManager.registeredListeners.map { it as ListenerAdapter }
 	}
 
 	fun addHandler(handler: ListenerAdapter) {
-		handlers.add(handler)
+		if (isActive) {
+			jda.addEventListener(handler)
+			return
+		}
+
+		builder.addEventListeners(handler)
 	}
 
 	fun delHandler(handler: ListenerAdapter) {
-		handlers.remove(handler)
-	}
-
-	fun build(): JDA {
-		include()
-
-		PluginLoader.load()
-		plugins.forEach { plugin ->
-			plugin.handlers.forEach { handler ->
-				handlers.add(handler)
-			}
+		if (isActive) {
+			jda.removeEventListener(handler)
+			return
 		}
 
-		handlers.map {
-			logger.info("Load event listener: ${it::class.simpleName}")
-			builder.addEventListeners(it)
-		}
-		builder.addEventListeners(commandContainer)
-
-		return builder.build()
+		builder.removeEventListeners(handler)
 	}
 
 	fun register(jda: JDA) {
 		commandContainer.register(jda)
-		handlers.forEach { h ->
-			if (h is CommandHandler) {
-				h.register(jda)
-			}
+		jda.eventManager.registeredListeners.filterIsInstance<CommandHandler>().forEach { h ->
+			h.register(jda)
 		}
 
 		Runtime.getRuntime().addShutdownHook(Thread {
-			PluginLoader.destroy()
+			destroy()
 		})
 	}
 
+	private fun include() {
+		if (BotConfig.bundle) {
+			val b = BundleModule()
+			loadModule(b.config, b)
+		}
+	}
+
+	private fun load() {
+		parentDir.listFiles()?.forEach { file ->
+			try {
+				loadPlugin(file)
+			} catch (ex: Exception) {
+				logger.error("error occurred while to plugin loading: ${ex.message}")
+			}
+		}
+
+		logger.info("Loaded ${plugins.size} plugins")
+	}
+
+	private fun destroy() {
+		val unloaded = mutableListOf<PluginConfig>()
+
+		plugins.forEach { (config, plugin) ->
+			logger.info("disable ${config.name} plugin...")
+
+			try {
+				plugin.destroy()
+			} catch (ex: Exception) {
+				logger.error("failed to destroy ${config.name} plugin")
+				ex.printStackTrace()
+			}
+		}
+
+		unloaded.forEach {
+			plugins.remove(it)
+		}
+	}
+
 	suspend fun reload(jda: JDA) {
 		if (!memLock.isLocked) {
 			memLock.lock()
 		}
 
-		PluginLoader.destroy()
-		plugins.forEach { plugin ->
-			plugin.handlers.filter { handlers.contains(it) }.map {
-				handlers.remove(it)
+		plugins.forEach { (_, plugin) ->
+			plugin.handlers.forEach {
+				delHandler(it)
 			}
 		}
 
-		include()
-		PluginLoader.load()
+		destroy()
+		logger.info(jda.eventManager.registeredListeners.size.toString())
 
-		plugins.forEach { plugin ->
-			plugin.handlers.forEach { handler ->
-				if (!handlers.contains(handler)) {
-					handlers.add(handler)
-					jda.addEventListener(handler)
-				}
+		load()
+		logger.info(jda.eventManager.registeredListeners.size.toString())
+
+		plugins.forEach { (_, plugin) ->
+			plugin.handlers.forEach {
+				addHandler(it)
 			}
 		}
 
-		handlers.forEach { h ->
-			if (h is CommandHandler) {
-				h.register(jda)
-			}
+		logger.info(jda.eventManager.registeredListeners.size.toString())
+
+		handlers.filterIsInstance<CommandHandler>().forEach { h ->
+			h.register(jda)
 		}
 
 		memLock.unlock()
 	}
 
-	object PluginLoader {
-		private val plugins = mutableMapOf<PluginConfig, Plugin>()
-		private val parentDir = File("./plugins").apply {
-			if (!exists()) {
-				mkdirs()
-			}
+	private fun loadPlugin(file: File) {
+		if (file.name == "px32-bot-module") {
+			return
 		}
 
-		fun getPlugins(): Map<PluginConfig, Plugin> {
-			return plugins.toMap()
+		if (!file.name.endsWith(".jar")) {
+			return
 		}
 
-		fun putModule(config: PluginConfig, plugin: Plugin) {
-			try {
-				logger.info("Load module ${config.name} v${config.version}")
-				plugin.onLoad()
-			} catch (ex: Exception) {
-				ex.printStackTrace()
-				plugin.destroy()
-				return
-			}
+		val jar = JarFile(file)
+		val cnf = jar.entries().toList().singleOrNull { jarEntry -> jarEntry.name == "plugin.json" }
+		if (cnf == null)
+			throw IllegalAccessException("${file.name} is not a plugin. aborted")
 
-			plugins[config] = plugin
+		val stream = jar.getInputStream(cnf)
+		val raw = stream.use {
+			return@use it.readBytes().toString(Charset.forName("UTF-8"))
 		}
 
-		fun load() {
-			parentDir.listFiles()?.forEach { file ->
-				try {
-					loadPlugin(file)
-				} catch (ex: Exception) {
-					logger.error("error occurred while to plugin loading: ${ex.message}")
-				}
-			}
+		val config = Json.decodeFromString<PluginConfig>(raw)
+		val cl = URLClassLoader(arrayOf(file.toPath().toUri().toURL()))
+		val obj = cl.loadClass(config.main).getDeclaredConstructor().newInstance()
 
-			logger.info("Loaded ${plugins.size} plugins")
-		}
+		if (obj !is Plugin)
+			throw IllegalAccessException("${config.name} is not valid plugin class. aborted")
 
-		fun destroy() {
-			val unloaded = mutableListOf<PluginConfig>()
-
-			plugins.forEach { (config, plugin) ->
-				logger.info("disable ${config.name} plugin...")
-
-				try {
-					plugin.destroy()
-				} catch (ex: Exception) {
-					logger.error("failed to destroy ${config.name} plugin")
-					ex.printStackTrace()
-				}
-
-				unloaded += config
-			}
-
-			unloaded.forEach {
-				plugins.remove(it)
-			}
-		}
-
-		private fun loadPlugin(file: File) {
-			if (file.name == "px32-bot-module") {
-				return
-			}
-
-			if (!file.name.endsWith(".jar")) {
-				return
-			}
-
-			val jar = JarFile(file)
-			val cnf = jar.entries().toList().singleOrNull { jarEntry -> jarEntry.name == "plugin.json" }
-			if (cnf == null)
-				return logger.error("${file.name} is not a plugin. aborted")
-
-			val stream = jar.getInputStream(cnf)
-			val raw = stream.use {
-				return@use it.readBytes().toString(Charset.forName("UTF-8"))
-			}
-
-			val config = Json.decodeFromString<PluginConfig>(raw)
-			val cl = URLClassLoader(arrayOf(file.toPath().toUri().toURL()))
-			val obj = cl.loadClass(config.main).getDeclaredConstructor().newInstance()
-
-			if (obj !is Plugin)
-				return logger.error("${config.name} is not valid main class. aborted")
-
-			try {
-				logger.info("Load plugin ${config.name} v${config.version}")
-				obj.onLoad()
-			} catch (ex: Exception) {
-				ex.printStackTrace()
-				return logger.error("Failed to load plugin ${config.name}")
-			}
-
-			plugins[config] = obj
+		try {
+			loadModule(config, obj)
+		} catch (ex: Exception) {
+			throw ex
 		}
 	}
+
+	private fun loadModule(config: PluginConfig, plugin: Plugin) {
+		try {
+			logger.info("Load plugin ${config.name} v${config.version}")
+			plugin.onLoad()
+		} catch (ex: Exception) {
+			try {
+				plugin.destroy()
+			} catch (ex: Exception) {
+				throw ex
+			}
+
+			throw ex
+		}
+
+		plugins[config] = plugin
+	}
+
+	fun build(): JDA {
+		if (isActive) {
+			logger.error("core kernel is already loaded! you cannot rebuild this kernel.")
+			return jda
+		}
+
+		include()
+		plugins.forEach { (_, plugin) ->
+			plugin.handlers.forEach { handler ->
+				logger.info("Load event listener: ${handler::class.simpleName}")
+				addHandler(handler)
+			}
+		}
+
+		builder.addEventListeners(commandContainer)
+		jda = builder.build()
+		isActive = true
+
+		Runtime.getRuntime().addShutdownHook(Thread {
+			isActive = false
+
+			logger.info("shutdown now Px32 kernel v${DefaultConfig.version}")
+			jda.shutdownNow()
+		})
+
+		return jda
+	}
 }