During May 2025, HyunUk Son established foundational scaffolding and documentation for the se-sac/sesac-01 repository, focusing on supporting class-based homework workflows. He created structured README.md files for class01 and class02, using Markdown to provide a clear template for future assignments and streamline onboarding. Additionally, he updated contributor information by correcting author attribution and adding completion statuses, ensuring accurate governance and accountability within the project. While no bug fixes were recorded, his work emphasized maintainability and clarity, leveraging documentation skills and version control best practices. The depth of contributions laid groundwork for efficient future development and improved repository organization.