Yoo Dong-geun is a South Korean actor. He is best known for his leading roles in the historical television dramas Tears of the Dragon, Empress Myseongseong, and Yeon Gaesomun. He was also an adjunct professor of 연기학담당 at Daekyeung University in 1997. Since 2007, Yoo has been an activist of Sunfull Movement, a non-profit organization against cyberbullying. On December 29, 2007, Yoo landed in the news for assaulting two producers of The King and I. Yoo was reportedly enraged because the scripts were routinely turned in late, which exhausted his wife Jeon In-hwa, an actress in the TV series. He later apologized for the incident.