During December 2024, Taehyun Lee focused on improving the reliability and maintainability of the ssu-student-union/homepage-frontend project. He addressed a LocalStorage type-safety issue by replacing the use of 'any' with a concrete TypeScript type, ensuring safer data handling across the application. Additionally, he unified the naming convention by refactoring categoryName to category throughout components and React hooks, which increased data consistency and reduced the risk of runtime errors. Working primarily with JavaScript, TypeScript, and React Hooks, Taehyun’s targeted bug fix enhanced the project’s overall code quality and established a stronger foundation for future frontend development.