During May 2025, Hay contributed to the se-sac/sesac-01 repository by creating foundational scaffolding for Homework README documentation, focusing on class01 and class02. Using Markdown and leveraging strong documentation skills, Hay standardized the structure and content of homework READMEs to improve onboarding and future maintainability. The work included cleaning up author attribution to accurately reflect LeeJiHye, which enhanced contributor tracking and repository hygiene. All changes were committed with traceability in mind, ensuring future updates can be audited efficiently. While the scope was limited to documentation and did not involve bug fixes, the work established a clear baseline for future content.