diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..c20e8cb
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,30 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [2024-11-30] - Build System & Script Engine Fixes
+
+### Fixed
+- **Release_NoGD Configuration**: Added missing compiler settings (SSE2, OpenMP, warning suppressions) to match Release configuration
+- **Debug Build Linker Error**: Added `_USE_32BIT_TIME_T` preprocessor definition to GlobalScript Debug configuration to fix `ParsePacket::HandleUserLogin` time_t size mismatch (LNK2019)
+- **Script Execution Crash**: Implemented VirtualAlloc with PAGE_EXECUTE_READWRITE for JIT code buffer allocation to resolve DEP-related memory access violations
+- **Standalone Debugging**: Modified `_RYL_TEST` mode to automatically enable `ADMIN_L3` without requiring Login.exe
+
+### Changed
+- **Working Directory**: Set LocalDebuggerWorkingDirectory to `F:\YouxiLand\ROW` for all configurations to enable proper resource loading during debugging
+- **Server IP Handling**: Modified `GetServerInfo()` to respect command-line IP arguments even in Debug builds, falling back to `127.0.0.1` only when no IP is provided
+- **Memory Management**: Enhanced `CVirtualMachine::Destroy()` to properly detect and free VirtualAlloc-allocated memory using VirtualQuery
+
+### Added
+- **Debug Logging**: Added MCF file decryption logging (`.decrypted.log` files) for script debugging
+- **Execute State Logging**: Added comprehensive state logging to `script_execute.log` before script execution
+
+### Technical Details
+- MCF XOR encryption key: `0x82fac623 ^ 0x601f1ac4`
+- Stack reserve size increased to 8MB for Debug configuration
+- Code buffer now allocated with executable permissions for JIT execution compatibility with Windows 10/11 DEP
+
+### Notes
+- Visual Studio 2010 project
+- DirectX 8 graphics API
+- Custom JIT script engine with x86 machine code execution
diff --git a/Client/Client/RYLClient/RYLClient.vcxproj b/Client/Client/RYLClient/RYLClient.vcxproj
index de758b8..5e42065 100644
--- a/Client/Client/RYLClient/RYLClient.vcxproj
+++ b/Client/Client/RYLClient/RYLClient.vcxproj
@@ -137,7 +137,6 @@
       <ProgramDatabaseFile>$(OutDir)Client.pdb</ProgramDatabaseFile>
       <SubSystem>Windows</SubSystem>
       <StackReserveSize>8388608</StackReserveSize>
-      <DataExecutionPrevention>false</DataExecutionPrevention>
       <TargetMachine>MachineX86</TargetMachine>
       <EnableUAC>false</EnableUAC>
       <UACExecutionLevel>HighestAvailable</UACExecutionLevel>
diff --git a/Client/Client/RYLClient/RYLClient/RYLClientMain.cpp b/Client/Client/RYLClient/RYLClient/RYLClientMain.cpp
index 9ce87c4..9548db1 100644
--- a/Client/Client/RYLClient/RYLClient/RYLClientMain.cpp
+++ b/Client/Client/RYLClient/RYLClient/RYLClientMain.cpp
@@ -602,6 +602,10 @@ USES_CONVERSION;
 VOID	CClientMain::GetServerInfo( HWND hWnd ) 
 {
 	char *strCommandLine = GetCommandLine() ;	
+	
+	// 기본값으로 초기화
+	strcpy(CRYLNetworkData::m_strIP, "");
+	CRYLNetworkData::m_dwServerID = 0;
 
 	if ( hWnd )
 	{
@@ -612,12 +616,19 @@ VOID	CClientMain::GetServerInfo( HWND hWnd )
 	else	
 	{
 		char *pLast = strrchr( strCommandLine, '"' ) ;
-		pLast += 2 ;
-		sscanf( pLast,"%s %d", CRYLNetworkData::m_strIP, &CRYLNetworkData::m_dwServerID ) ;
+		if (pLast)
+		{
+			pLast += 2 ;
+			sscanf( pLast,"%s %d", CRYLNetworkData::m_strIP, &CRYLNetworkData::m_dwServerID ) ;
+		}
 	}
 
 #ifdef DEBUG
-	strcpy(CRYLNetworkData::m_strIP, "127.0.0.1");
+	// 명령줄에서 IP를 받지 못한 경우에만 기본값 사용
+	if (strlen(CRYLNetworkData::m_strIP) == 0 || strcmp(CRYLNetworkData::m_strIP, "") == 0)
+	{
+		strcpy(CRYLNetworkData::m_strIP, "127.0.0.1");
+	}
 #endif
 /*
 	if ( m_wAdminMode == ADMIN_L3 )
diff --git a/Client/Client/ScriptEngine/VirtualMachine.cpp b/Client/Client/ScriptEngine/VirtualMachine.cpp
index 3c545ac..0603641 100644
--- a/Client/Client/ScriptEngine/VirtualMachine.cpp
+++ b/Client/Client/ScriptEngine/VirtualMachine.cpp
@@ -10,6 +10,7 @@
 #include <fstream>
 #include <set>
 #include "GMMemory.h"
+#include <windows.h>
 
 typedef unsigned char byte;
 
@@ -232,7 +233,11 @@ void			CVirtualMachine::Create( const void * pDataBuf, unsigned DataSize )
 
 	TotalBufferSize = GlobalVarBufferSize + StringBufferSize + m_iCodeSize;
 
-	m_pGlobalVars = m_pBuffer = new char[TotalBufferSize];
+	// Use VirtualAlloc for executable code buffer
+	m_pGlobalVars = m_pBuffer = (char*)VirtualAlloc(NULL, TotalBufferSize, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
+	if (m_pBuffer == NULL) {
+		m_pGlobalVars = m_pBuffer = new char[TotalBufferSize];
+	}
 	m_pStringBuffer = ((byte*)m_pGlobalVars) + GlobalVarBufferSize;
 	m_pCodeBuffer = ((byte*)m_pStringBuffer) + StringBufferSize;
 
@@ -277,7 +282,11 @@ void			CVirtualMachine::Create( CIntermediateCode & IMCode, CSymbolTable & Symbo
 	int StringBufferSize = SymbolTable.GetStringBufferSize();
 	int BufSize = GlobalVarsSize + StringBufferSize + m_iCodeSize;
 
-	m_pGlobalVars = m_pBuffer = new char[ BufSize ];
+	// Use VirtualAlloc for executable code buffer
+	m_pGlobalVars = m_pBuffer = (char*)VirtualAlloc(NULL, BufSize, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE);
+	if (m_pBuffer == NULL) {
+		m_pGlobalVars = m_pBuffer = new char[ BufSize ];
+	}
 
 	memset( m_pGlobalVars, 0, GlobalVarsSize );
 
@@ -329,7 +338,15 @@ void			CVirtualMachine::SetSysVars()
 
 void			CVirtualMachine::Destroy()
 {
-	delete [] m_pBuffer;
+	// Check if buffer was allocated with VirtualAlloc (aligned to 4KB/64KB boundary typically)
+	if (m_pBuffer != NULL) {
+		MEMORY_BASIC_INFORMATION mbi;
+		if (VirtualQuery(m_pBuffer, &mbi, sizeof(mbi)) && mbi.AllocationBase == m_pBuffer) {
+			VirtualFree(m_pBuffer, 0, MEM_RELEASE);
+		} else {
+			delete [] m_pBuffer;
+		}
+	}
 	m_pBuffer = m_pGlobalVars = m_pStringBuffer = m_pCodeBuffer = NULL;
 	m_iCodeSize = 0;
 	m_pFunctionMap->clear();