sentences:  In 2000, he started his show business career as a video jockey on Mnet and debuted as an actor in the TV series "School 4" in 2001.Thereafter, Gong did a number of supporting roles in dramas and movies and also hosted the music program "Music Camp" in 2004.In 2005, he landed his first lead role in SBS's "Hello My Teacher" opposite Gong Hyo-jin.