Worst Friends () is a 2009 South Korean short film starring Kim Soo-hyun. Its directorial intention is a retrospective of losing a friend in delirious Seoul. Directed and written by Namkoong Sun, it was made at the Korea National University of Arts' Department of Film Graduation Workshop.
Jun-ki (Kim Soo-hyun), a boy with shaggy hair that covers his face, returns to Korea from an unsuccessful American educational trip. When the 19 year old In-sun hears that her first ever intimate experience partner is coming back, she is thrilled.