Jin focused on enhancing documentation for the hoodong/2025-2-PLC repository, delivering a comprehensive update to the 1조.md file. Using Markdown and leveraging strong documentation skills, Jin expanded student data coverage by adding university, major, residence, and hometown details, while also improving formatting with clearer line breaks and a welcoming Hello line. The work did not involve functional code changes or bug fixes, but instead prioritized data accuracy and readability. By maintaining a clear commit history, Jin ensured traceability and set a foundation for future contributions, ultimately supporting more efficient onboarding and easier data access for project collaborators.