During December 2024, Youngsuk Kim focused on improving the espressif/llvm-project by addressing a critical bug affecting thread-local storage on AMDGPU targets. He recovered a deleted AddrSpaceCast in ItaniumCXXABI.cpp, ensuring correct address space handling for thread-local variables and enhancing cross-target reliability. To validate this fix, he introduced a dedicated regression test, amdgpu_threadprivate.cpp, which verifies proper address space casting for thread-local variables. His work leveraged expertise in C++, LLVM, and compiler development, demonstrating a deep understanding of code generation and target-specific ABI requirements. This contribution improved the stability and correctness of AMDGPU builds for downstream projects and users.