diff --git a/CMakeLists.txt b/CMakeLists.txt
index 36d0d4c..7217b41 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -12,6 +12,6 @@ add_library(solanaceae_util
 
 target_include_directories(solanaceae_util PUBLIC .)
 target_compile_features(solanaceae_util PUBLIC cxx_std_17)
-#target_link_libraries(solanaceae_contact PUBLIC
+#target_link_libraries(solanaceae_util PUBLIC
 #)
 
diff --git a/solanaceae/util/simple_config_model.cpp b/solanaceae/util/simple_config_model.cpp
new file mode 100644
index 0000000..5bae34e
--- /dev/null
+++ b/solanaceae/util/simple_config_model.cpp
@@ -0,0 +1,168 @@
+#include "./simple_config_model.hpp"
+
+#include <iostream>
+
+void SimpleConfigModel::set(CM_ISV module, CM_ISV category, CM_ISV entry, const bool value) { _map_bool[module][category].second[entry] = value; }
+
+void SimpleConfigModel::set(CM_ISV module, CM_ISV category, CM_ISV entry, const int64_t value) { _map_int[module][category].second[entry] = value; }
+
+void SimpleConfigModel::set(CM_ISV module, CM_ISV category, CM_ISV entry, const double value) { _map_double[module][category].second[entry] = value; }
+
+void SimpleConfigModel::set(CM_ISV module, CM_ISV category, CM_ISV entry, CM_ISV value) { _map_string[module][category].second[entry] = value; }
+
+bool SimpleConfigModel::has_bool(CM_ISV module, CM_ISV category, CM_ISV entry) { return _map_bool.count(module) && _map_bool[module].count(category) && _map_bool[module][category].second.count(entry); }
+
+bool SimpleConfigModel::has_int(CM_ISV module, CM_ISV category, CM_ISV entry) { return _map_int.count(module) && _map_int[module].count(category) && _map_int[module][category].second.count(entry); }
+
+bool SimpleConfigModel::has_double(CM_ISV module, CM_ISV category, CM_ISV entry) { return _map_double.count(module) && _map_double[module].count(category) && _map_double[module][category].second.count(entry); }
+
+bool SimpleConfigModel::has_string(CM_ISV module, CM_ISV category, CM_ISV entry) { return _map_string.count(module) && _map_string[module].count(category) && _map_string[module][category].second.count(entry); }
+
+CM_InternalOptional<bool> SimpleConfigModel::get_bool(CM_ISV module, CM_ISV category, CM_ISV entry) {
+	auto& map = _map_bool;
+	if (!map.count(module) || !map[module].count(category)) {
+		return std::nullopt;
+	} else if (map[module][category].second.count(entry)) {
+		return map[module][category].second[entry];
+	} else {
+		return map[module][category].first;
+	}
+}
+
+CM_InternalOptional<int64_t> SimpleConfigModel::get_int(CM_ISV module, CM_ISV category, CM_ISV entry) {
+	auto& map = _map_int;
+	if (!map.count(module) || !map[module].count(category)) {
+		return std::nullopt;
+	} else if (map[module][category].second.count(entry)) {
+		return map[module][category].second[entry];
+	} else {
+		return map[module][category].first;
+	}
+}
+
+CM_InternalOptional<double> SimpleConfigModel::get_double(CM_ISV module, CM_ISV category, CM_ISV entry) {
+	auto& map = _map_double;
+	if (!map.count(module) || !map[module].count(category)) {
+		return std::nullopt;
+	} else if (map[module][category].second.count(entry)) {
+		return map[module][category].second[entry];
+	} else {
+		return map[module][category].first;
+	}
+}
+
+CM_InternalOptional<CM_ISV> SimpleConfigModel::get_string(CM_ISV module, CM_ISV category, CM_ISV entry) {
+	auto& map = _map_string;
+	if (!map.count(module) || !map[module].count(category)) {
+		return std::nullopt;
+	} else if (map[module][category].second.count(entry)) {
+		return CM_ISV{map[module][category].second[entry]};
+	} else if (map[module][category].first.has_value()){
+		return CM_ISV{map[module][category].first.value()};
+	} else {
+		return std::nullopt;
+	}
+}
+
+void SimpleConfigModel::set(CM_ISV module, CM_ISV category, const bool value) { _map_bool[module][category].first = value; }
+
+void SimpleConfigModel::set(CM_ISV module, CM_ISV category, const int64_t value) { _map_int[module][category].first = value; }
+
+void SimpleConfigModel::set(CM_ISV module, CM_ISV category, const double value) { _map_double[module][category].first = value; }
+
+void SimpleConfigModel::set(CM_ISV module, CM_ISV category, CM_ISV value) { _map_string[module][category].first = value; }
+
+bool SimpleConfigModel::has_bool(CM_ISV module, CM_ISV category) { return _map_bool.count(module) && _map_bool[module].count(category) && _map_bool[module][category].first.has_value(); }
+
+bool SimpleConfigModel::has_int(CM_ISV module, CM_ISV category) { return _map_int.count(module) && _map_int[module].count(category) && _map_int[module][category].first.has_value(); }
+
+bool SimpleConfigModel::has_double(CM_ISV module, CM_ISV category) { return _map_double.count(module) && _map_double[module].count(category) && _map_double[module][category].first.has_value(); }
+
+bool SimpleConfigModel::has_string(CM_ISV module, CM_ISV category) { return _map_string.count(module) && _map_string[module].count(category) && _map_string[module][category].first.has_value(); }
+
+CM_InternalOptional<bool> SimpleConfigModel::get_bool(CM_ISV module, CM_ISV category) {
+	auto& map = _map_bool;
+	if (!map.count(module) || !map[module].count(category)) {
+		return std::nullopt;
+	} else {
+		return map[module][category].first;
+	}
+}
+
+CM_InternalOptional<int64_t> SimpleConfigModel::get_int(CM_ISV module, CM_ISV category) {
+	auto& map = _map_int;
+	if (!map.count(module) || !map[module].count(category)) {
+		return std::nullopt;
+	} else {
+		return map[module][category].first;
+	}
+}
+
+CM_InternalOptional<double> SimpleConfigModel::get_double(CM_ISV module, CM_ISV category) {
+	auto& map = _map_double;
+	if (!map.count(module) || !map[module].count(category)) {
+		return std::nullopt;
+	} else {
+		return map[module][category].first;
+	}
+}
+
+CM_InternalOptional<CM_ISV> SimpleConfigModel::get_string(CM_ISV module, CM_ISV category) {
+	auto& map = _map_string;
+	if (!map.count(module) || !map[module].count(category)) {
+		return std::nullopt;
+	} else if (map[module][category].first.has_value()){
+		return CM_ISV{map[module][category].first.value()};
+	} else {
+		return std::nullopt;
+	}
+}
+
+void SimpleConfigModel::dump(void) {
+	std::cout << "SCM dump:\n";
+	for (const auto& [k_m, v_c] : _map_bool) {
+		for (const auto& [k_c, v_e] : v_c) {
+			if (v_e.first.has_value()) {
+				std::cout << "  " << k_m << "::" << k_c << " = " << (v_e.first.value()?"true":"false") << "\n";
+			}
+
+			for (const auto& [k_e, e] : v_e.second) {
+				std::cout << "  " << k_m << "::" << k_c << "::" << k_e << " = " << (e?"true":"false") << "\n";
+			}
+		}
+	}
+	for (const auto& [k_m, v_c] : _map_int) {
+		for (const auto& [k_c, v_e] : v_c) {
+			if (v_e.first.has_value()) {
+				std::cout << "  " << k_m << "::" << k_c << " = " << v_e.first.value() << "\n";
+			}
+
+			for (const auto& [k_e, e] : v_e.second) {
+				std::cout << "  " << k_m << "::" << k_c << "::" << k_e << " = " << e << "\n";
+			}
+		}
+	}
+	for (const auto& [k_m, v_c] : _map_double) {
+		for (const auto& [k_c, v_e] : v_c) {
+			if (v_e.first.has_value()) {
+				std::cout << "  " << k_m << "::" << k_c << " = " << v_e.first.value() << "\n";
+			}
+
+			for (const auto& [k_e, e] : v_e.second) {
+				std::cout << "  " << k_m << "::" << k_c << "::" << k_e << " = " << e << "\n";
+			}
+		}
+	}
+	for (const auto& [k_m, v_c] : _map_string) {
+		for (const auto& [k_c, v_e] : v_c) {
+			if (v_e.first.has_value()) {
+				std::cout << "  " << k_m << "::" << k_c << " = " << v_e.first.value() << "\n";
+			}
+
+			for (const auto& [k_e, e] : v_e.second) {
+				std::cout << "  " << k_m << "::" << k_c << "::" << k_e << " = " << e << "\n";
+			}
+		}
+	}
+}
+
diff --git a/solanaceae/util/simple_config_model.hpp b/solanaceae/util/simple_config_model.hpp
new file mode 100644
index 0000000..797587e
--- /dev/null
+++ b/solanaceae/util/simple_config_model.hpp
@@ -0,0 +1,45 @@
+#pragma once
+
+#include "./config_model.hpp"
+
+#include <map>
+
+struct SimpleConfigModel : public ConfigModelI {
+	std::map<std::string, std::map<std::string, std::pair<std::optional<bool>, std::map<std::string, bool>>>> _map_bool;
+	std::map<std::string, std::map<std::string, std::pair<std::optional<int64_t>, std::map<std::string, int64_t>>>> _map_int;
+	std::map<std::string, std::map<std::string, std::pair<std::optional<double>, std::map<std::string, double>>>> _map_double;
+	std::map<std::string, std::map<std::string, std::pair<std::optional<std::string>, std::map<std::string, std::string>>>> _map_string;
+
+	// level3
+	void set(CM_ISV module, CM_ISV category, CM_ISV entry, const bool value) override;
+	void set(CM_ISV module, CM_ISV category, CM_ISV entry, const int64_t value) override;
+	void set(CM_ISV module, CM_ISV category, CM_ISV entry, const double value) override;
+	void set(CM_ISV module, CM_ISV category, CM_ISV entry, CM_ISV value) override;
+	bool has_bool(CM_ISV module, CM_ISV category, CM_ISV entry) override;
+	bool has_int(CM_ISV module, CM_ISV category, CM_ISV entry) override;
+	bool has_double(CM_ISV module, CM_ISV category, CM_ISV entry) override;
+	bool has_string(CM_ISV module, CM_ISV category, CM_ISV entry) override;
+
+	CM_InternalOptional<bool> get_bool(CM_ISV module, CM_ISV category, CM_ISV entry) override;
+	CM_InternalOptional<int64_t> get_int(CM_ISV module, CM_ISV category, CM_ISV entry) override;
+	CM_InternalOptional<double> get_double(CM_ISV module, CM_ISV category, CM_ISV entry) override;
+	CM_InternalOptional<CM_ISV> get_string(CM_ISV module, CM_ISV category, CM_ISV entry) override;
+
+	// level2
+	void set(CM_ISV module, CM_ISV category, const bool value) override;
+	void set(CM_ISV module, CM_ISV category, const int64_t value) override;
+	void set(CM_ISV module, CM_ISV category, const double value) override;
+	void set(CM_ISV module, CM_ISV category, CM_ISV value) override;
+	bool has_bool(CM_ISV module, CM_ISV category) override;
+	bool has_int(CM_ISV module, CM_ISV category) override;
+	bool has_double(CM_ISV module, CM_ISV category) override;
+	bool has_string(CM_ISV module, CM_ISV category) override;
+	CM_InternalOptional<bool> get_bool(CM_ISV module, CM_ISV category) override;
+	CM_InternalOptional<int64_t> get_int(CM_ISV module, CM_ISV category) override;
+	CM_InternalOptional<double> get_double(CM_ISV module, CM_ISV category) override;
+	CM_InternalOptional<CM_ISV> get_string(CM_ISV module, CM_ISV category) override;
+
+	// debug
+	void dump(void);
+};
+