Who directed the highest-grossing South Korean film of all time in 2001 and its sequel in 2013?
Friend: The Great Legacy: Friend: The Great Legacy (; lit. Friend: The Great Legacy:  It is the sequel to the 2001 box-office hit "Friend", also directed by Kwak Kyung-taek. Friend (2001 film): Friend () is a 2001 South Korean film written and directed by Kwak Kyung-taek.
Kwak Kyung-taek