Yun is a teenager from Hong Kong and Yang's older brother. In contrast to the more serious Yang, Yun loves having fun and one of his main hobbies is skateboarding. He works in a restaurant run by his grandfather.
Yun made a cameo in Chun-Li's prologue of Street Fighter 4, voiced by Ted Sroka. When he was added to the arcade edition of Super Street Fighter 4, he was instead portrayed by Todd Haberkorn.