During April 2025, Hyungmin Oh focused on maintainability enhancements for the DaleStudy/leetcode-study repository, delivering two core features centered on documentation and configuration management. He improved problem-set documentation by adding detailed time complexity notes to markdown files, enabling users to better understand performance considerations. Additionally, he refined repository hygiene by updating the .gitignore file and standardizing formatting, which streamlines onboarding for new contributors and reduces future maintenance overhead. Working primarily with Git and Markdown, Hyungmin’s contributions addressed long-term quality and collaboration, emphasizing clarity and maintainability rather than immediate bug fixes, and laying a solid foundation for future development.