Mari iyagi (2002)

Director: Lee Sung-gang
Cast: Ahn Sung-ki, Bae Jong-ok, Gong Hyung-jin, Jang Hang-seon, Lee Byung-hun, Lee Seok-jun, Na Moon-hee, Ryu Deok-hwan

Synopsis:

Kim Nam-woo struggles through life as people around him constantly leave him; his best friend, Jun-ho, is going to study in Seoul and in some ways his widowed mother is “leaving” him too by paying more attention to her new boyfriend. To escape, he goes to a dream world, where he meets a girl named Mari. The story follows Nam-woo in discovering himself and maturing.