Oh Man-seok is a South Korean actor. Best known for playing the titular transgender singer in rock musical Hedwig and the Angry Inch, Oh's acting career spans theater, television and film.

Hedwig and the Angry Inch is a rock musical with music and lyrics by Stephen Trask and a book by John Cameron Mitchell. The musical follows Hedwig Robinson, a genderqueer East German singer of a fictional rock and roll band. The story draws on Mitchell's life as the child of a U.S. Army major general who once commanded the U.S. sector of occupied West Berlin. The character of Hedwig was inspired by a German divorced U.S. Army wife who was Mitchell's family babysitter and moonlighted as a prostitute at her trailer park home in Junction City, Kansas. The music is steeped in the androgynous 1970s glam rock style of David Bowie, as well as the work of John Lennon and early punk performers Lou Reed and Iggy Pop.