During May 2025, HyunUk Son focused on establishing foundational documentation and project scaffolding within the se-sac/sesac-01 repository. He created structured README.md files for class01 and class02, laying the groundwork for class-based homework workflows and improving onboarding for new contributors. Using Markdown and leveraging his documentation skills, HyunUk Son also updated the SonHyunUk README entry to accurately reflect completion statuses and correct author attribution. While no bugs were addressed during this period, his work enhanced repository maintainability and governance, ensuring clearer accountability and enabling more efficient future development. The contributions were foundational, emphasizing clarity and sustainable project structure.