Yejun Lee expanded the asset library for the 아동3 collection in the kkkjj5199/podowon repository, focusing on front-end development with JavaScript. Their work involved adding twenty new WEBP image assets to enhance visual variety without altering core code, supporting faster asset delivery and consistent display. Yejun also tuned configuration parameters in digital.js, adjusting frame and numeric settings to refine the display and behavior of 아동3 elements. By prioritizing configuration changes over code modifications, they minimized deployment risk and maintained stability. The work demonstrated a methodical approach to feature enhancement, emphasizing traceability, low-risk releases, and maintainable asset management practices.