During October 2025, Hien Nguyen Thanh enhanced the user experience of video conference emoji reactions in the nccasia/mezon-fe repository. Focusing on front end development with React and TypeScript, Hien refined the animation duration for emoji reactions and improved the styling of display names, resulting in a more responsive and visually appealing interface. The work addressed perceived responsiveness by tuning reaction speed and resolving a merge conflict to ensure stable integration. Although the scope was limited to a single feature, the contribution demonstrated attention to UI/UX detail and effective use of CSS and React to deliver a polished, user-focused improvement.