diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index d47e380..cc1b956 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -5,6 +5,7 @@ target_sources(YYCCommonplace
 PRIVATE
     # Sources
     COMHelper.cpp
+    ConfigManager.cpp
     ConsoleHelper.cpp
     DialogHelper.cpp
     EncodingHelper.cpp
@@ -21,6 +22,7 @@ FILES
     # Headers
     # Common headers
     COMHelper.hpp
+    ConfigManager.hpp
     ConsoleHelper.hpp
     DialogHelper.hpp
     EncodingHelper.hpp
diff --git a/src/ConfigManager.cpp b/src/ConfigManager.cpp
new file mode 100644
index 0000000..cc6cfc8
--- /dev/null
+++ b/src/ConfigManager.cpp
@@ -0,0 +1,148 @@
+#include "ConfigManager.hpp"
+
+#include "EncodingHelper.hpp"
+#include "IOHelper.hpp"
+
+namespace YYCC::ConfigManager {
+
+#pragma region Core Manager
+
+	CoreManager::CoreManager(
+		const yycc_char8_t* cfg_file_path,
+		uint64_t version_identifier,
+		std::initializer_list<AbstractSetting*> settings) :
+		m_CfgFilePath(), m_VersionIdentifier(version_identifier), m_Settings() {
+		// assign cfg path
+		if (cfg_file_path != nullptr)
+			m_CfgFilePath = cfg_file_path;
+		// assign settings
+		for (auto* setting : settings) {
+			m_Settings.try_emplace(setting->GetName(), setting);
+		}
+	}
+
+	bool CoreManager::Load() {
+		// reset all settings first
+		Reset();
+
+		// get file handle
+		auto fs = this->GetFileHandle(YYCC_U8("rb"));
+		if (fs.get() == nullptr) {
+			// if we fail to get, it means that we do not have corresponding cfg file.
+			// all settings should be reset to default value.
+			return true;
+		}
+
+		// fetch version info
+		uint64_t version_info;
+		if (std::fread(&version_info, sizeof(version_info), 1u, fs.get()) != sizeof(version_info))
+			return false;
+		// check version
+		// if read version is greater than we expected,
+		// it means that this cfg file is created by the program higer than this.
+		// we should not read anything from it.
+		// however, for compaitibility reason, we allow read old cfg data.
+		if (version_info > m_VersionIdentifier)
+			return true;
+
+		// fetch setting item from file
+		yycc_u8string name_cache;
+		while (true) {
+			// try fetch setting name
+			// fetch name length
+			size_t name_length;
+			if (std::fread(&name_length, sizeof(name_length), 1u, fs.get()) != sizeof(name_length)) {
+				// we also check whether reach EOF at there.
+				if (std::feof(fs.get())) break;
+				else return false;
+			}
+			// fetch name body
+			name_cache.resize(name_length);
+			if (std::fread(name_cache.data(), name_length, 1u, fs.get()) != name_length)
+				return false;
+
+			// get setting data length
+			size_t data_length;
+			if (std::fread(&data_length, sizeof(data_length), 1u, fs.get()) != sizeof(data_length))
+				return false;
+
+			// get matched setting first
+			const auto& found = m_Settings.find(name_cache);
+			if (found != m_Settings.end()) {
+				// found. read data for it
+				found->second->ResizeData(data_length);
+				if (std::fread(found->second->GetDataPtr(), data_length, 1u, fs.get()) != data_length)
+					return false;
+				// call user defined load function
+				// if fail to parse, reset to default value
+				if (!found->second->UserLoad())
+					found->second->UserReset();
+			} else {
+				// fail to find. skip this unknown setting
+				if (fseek(fs.get(), static_cast<long>(data_length), SEEK_CUR) != 0)
+					return false;
+			}
+		}
+
+		return true;
+	}
+
+	bool CoreManager::Save() {
+		// get file handle
+		auto fs = this->GetFileHandle(YYCC_U8("wb"));
+		// if we fail to get, return false.
+		if (fs == nullptr) return false;
+
+		// write config data
+		uint64_t version_info = m_VersionIdentifier;
+		if (std::fwrite(&version_info, sizeof(version_info), 1u, fs.get()) != sizeof(version_info))
+			return false;
+
+		// iterate all data for writing
+		for (const auto& pair : m_Settings) {
+			// do user defined save
+			// if failed, skip this setting
+			if (!pair.second->UserSave())
+				continue;
+
+			// write setting name
+			// write name length
+			size_t name_length = pair.first.size();
+			if (std::fwrite(&name_length, sizeof(name_length), 1u, fs.get()) != sizeof(name_length))
+				return false;
+			// write name body
+			if (std::fwrite(pair.first.c_str(), name_length, 1u, fs.get()) != name_length)
+				return false;
+
+			// write setting daat
+			// write data length
+			size_t data_length = pair.second->GetDataSize();
+			if (std::fwrite(&data_length, sizeof(data_length), 1u, fs.get()) != sizeof(data_length))
+				return false;
+			// write data body
+			if (std::fwrite(pair.second->GetDataPtr(), data_length, 1u, fs.get()) != data_length)
+				return false;
+		}
+
+		// all settings done, return true
+		return true;
+	}
+
+	void CoreManager::Reset() {
+		for (const auto& pair : m_Settings) {
+			pair.second->UserReset();
+		}
+	}
+
+	CoreManager::FileHandleGuard_t CoreManager::GetFileHandle(const yycc_char8_t* mode) const {
+		return CoreManager::FileHandleGuard_t(
+			IOHelper::UTF8FOpen(this->m_CfgFilePath.c_str(), mode),
+			[](FILE* fs) -> void {
+				if (fs != nullptr) std::fclose(fs);
+			}
+		);
+	}
+
+#pragma endregion
+
+}
diff --git a/src/ConfigManager.hpp b/src/ConfigManager.hpp
new file mode 100644
index 0000000..c57fd17
--- /dev/null
+++ b/src/ConfigManager.hpp
@@ -0,0 +1,200 @@
+#pragma once
+#include "YYCCInternal.hpp"
+
+#include <memory>
+#include <vector>
+#include <map>
+#include <initializer_list>
+#include <type_traits>
+#include <algorithm>
+#include <functional>
+#include <stdexcept>
+
+namespace YYCC::ConfigManager {
+
+	template<typename _Ty>
+	struct Constrain {
+		using CheckFct_t = std::function<bool(const _Ty&)>;
+		//using CorrectFct_t = std::function<_Ty(const _Ty&)>;
+		CheckFct_t m_CheckFct;
+		//CorrectFct_t m_CorrectFct;
+
+		bool IsValid() const {
+			return m_CheckFct != nullptr/* && m_CorrectFct != nullptr*/;
+		}
+	};
+
+	namespace ConstrainPresets {
+
+		template<typename _Ty, std::enable_if_t<std::is_arithmetic_v<_Ty>, int> = 0>
+		Constrain<_Ty> GetNumberRangeConstrain(_Ty min_value, _Ty max_value) {
+			if (min_value > max_value)
+				throw std::invalid_argument("invalid min max value for NumberRangeConstrain");
+			return Constrain<_Ty> {
+				[min_value, max_value](const _Ty& val) -> bool { return (val <= max_value) && (val >= min_value); }
+					/*[min_value, max_value](const _Ty& val) -> _Ty { return std::clamp(val, min_value, max_value); }*/
+			};
+		}
+
+	}
+
+	class AbstractSetting {
+		friend class CoreManager;
+	public:
+		AbstractSetting(const yycc_char8_t* name) : m_Name(), m_RawData() {
+			if (name != nullptr) m_Name = name;
+		}
+		virtual ~AbstractSetting() {}
+
+		// Name interface
+	public:
+		const yycc_u8string& GetName() const { return m_Name; }
+	private:
+		yycc_u8string m_Name;
+
+		// User Implementations
+	protected:
+		virtual bool UserLoad() = 0;
+		virtual bool UserSave() = 0;
+		virtual void UserReset() = 0;
+
+		// Buffer related functions
+	protected:
+		void ResizeData(size_t new_size) { m_RawData.resize(new_size); }
+		const void* GetDataPtr() const { return m_RawData.data(); }
+		void* GetDataPtr() { return m_RawData.data(); }
+		size_t GetDataSize() const { return m_RawData.size(); }
+	private:
+		std::vector<uint8_t> m_RawData;
+	};
+
+	class CoreManager {
+	public:
+		CoreManager(
+			const yycc_char8_t* cfg_file_path,
+			uint64_t version_identifier,
+			std::initializer_list<AbstractSetting*> settings);
+		~CoreManager() {}
+
+		// Core functions
+	public:
+		bool Load();
+		bool Save();
+		void Reset();
+
+	private:
+		using FileHandleGuard_t = std::unique_ptr<FILE, std::function<void(FILE*)>>;
+		FileHandleGuard_t GetFileHandle(const yycc_char8_t* mode) const;
+
+		yycc_u8string m_CfgFilePath;
+		uint64_t m_VersionIdentifier;
+		std::map<yycc_u8string, AbstractSetting*> m_Settings;
+	};
+
+#pragma region Setting Presets
+
+	template<typename _Ty, std::enable_if_t<std::is_arithmetic_v<_Ty>, int> = 0>
+	class NumberSetting : public AbstractSetting {
+	public:
+		NumberSetting(const yycc_char8_t* name, _Ty default_value, Constrain<_Ty> constrain = Constrain<_Ty> {}) :
+			AbstractSetting(name), m_Data(default_value), m_DefaultData(default_value), m_Constrain(constrain) {}
+		virtual ~NumberSetting() {}
+
+		_Ty Get() const { return m_Data; }
+		bool Set(_Ty new_data) { 
+			// validate data
+			if (m_Constrain.IsValid() && !m_Constrain.m_CheckFct(m_Data))
+				return false;
+			// assign data
+			m_Data = new_data;
+			return true;
+		}
+
+	protected:
+		virtual bool UserLoad() override {
+			// read data
+			if (sizeof(m_Data) != GetDataSize())
+				return false;
+			m_Data = *reinterpret_cast<const _Ty*>(GetDataPtr());
+			// check data
+			if (m_Constrain.IsValid() && !m_Constrain.m_CheckFct(m_Data))
+				return false;
+			return true;
+		}
+		virtual bool UserSave() override {
+			// write data
+			ResizeData(sizeof(m_Data));
+			*reinterpret_cast<_Ty*>(GetDataPtr()) = m_Data;
+			return true;
+		}
+		virtual void UserReset() override {
+			m_Data = m_DefaultData;
+		}
+
+		_Ty m_Data, m_DefaultData;
+		Constrain<_Ty> m_Constrain;
+	};
+
+	class StringSetting : public AbstractSetting {
+	public:
+		StringSetting(const yycc_char8_t* name, const yycc_char8_t* default_value, Constrain<yycc_u8string> constrain = Constrain<yycc_u8string> {}) :
+			AbstractSetting(name), m_Data(), m_DefaultData(), m_Constrain(constrain) {
+			if (default_value != nullptr) {
+				m_Data = default_value;
+				m_DefaultData = default_value;
+			}
+		}
+		virtual ~StringSetting() {}
+
+		const yycc_u8string& Get() const { return m_Data; }
+		bool Set(const yycc_char8_t* new_data) {
+			// check data validation
+			if (new_data == nullptr) 
+				return false;
+			if (m_Constrain.IsValid() && !m_Constrain.m_CheckFct(m_Data))
+				return false;
+			// assign data
+			m_Data = new_data;
+			return true;
+		}
+
+	protected:
+		virtual bool UserLoad() override {
+			// read string length
+			size_t string_length;
+			if (GetDataSize() < sizeof(string_length))
+				return false;
+			string_length = *reinterpret_cast<const size_t*>(GetDataPtr());
+			// read string body
+			if (GetDataSize() != sizeof(string_length) + string_length)
+				return false;
+			m_Data.assign(
+				reinterpret_cast<const yycc_char8_t*>(static_cast<const uint8_t*>(GetDataPtr()) + sizeof(string_length)),
+				string_length
+			);
+			// check data
+			if (m_Constrain.IsValid() && !m_Constrain.m_CheckFct(m_Data))
+				return false;
+			return true;
+		}
+		virtual bool UserSave() override {
+			// allocate result buffer
+			size_t string_length = m_Data.size();
+			ResizeData(sizeof(string_length) + string_length);
+			// get pointer
+			uint8_t* ptr = static_cast<uint8_t*>(GetDataPtr());
+			// assign string length
+			*reinterpret_cast<size_t*>(ptr) = string_length;
+			// assign string body
+			std::memcpy(ptr + sizeof(string_length), m_Data.data(), string_length);
+			return true;
+		}
+
+		yycc_u8string m_Data, m_DefaultData;
+		Constrain<yycc_u8string> m_Constrain;
+	};
+
+#pragma endregion
+
+
+}
diff --git a/src/YYCCommonplace.hpp b/src/YYCCommonplace.hpp
index 865c191..3a4f5a2 100644
--- a/src/YYCCommonplace.hpp
+++ b/src/YYCCommonplace.hpp
@@ -12,3 +12,5 @@
 #include "WinFctHelper.hpp"
 #include "FsPathPatch.hpp"
 #include "ExceptionHelper.hpp"
+
+#include "ConfigManager.hpp"