DiscoverCheon Seong-hoonCheon Seong-hoonActorBornSeptember 13, 1976 (age 50) · South KoreaKnown forI'm a Cyborg, But That's OKDecember 7, 2006Die BadJuly 15, 2000I Am a FatherApril 14, 2011You Used To Smile That WayJanuary 1, 2009Acting42011I Am a Father as Gi-bok2009You Used To Smile That Way2006I'm a Cyborg, But That's OK as Hwang Gyu-suk2000Die Bad as Dong-su