Which actor played the physically abusive teacher in a 2001 highest grossing film?
Kim Kwang-kyu (actor): Kim Kwang-kyu (born December 8, 1967) is a South Korean actor. Kim Kwang-kyu (actor):  He made his acting debut in 1999 in "Dr. K", and its director fellow Busan native Kwak Kyung-taek later cast him in a small but memorable role as a physically abusive teacher in the 2001 box-office hit "Friend". Friend (2001 film): Friend () is a 2001 South Korean film written and directed by Kwak Kyung-taek. Friend (2001 film):  Upon its release, it became the highest-grossing South Korean movie of all time.
Kim Kwang-kyu