Commitment (Korean: 동창생; Hanja: 同窓生; RR: Dongchangsaeng; lit. "Alumnus" or "The Graduate") is a 2013 South Korean action drama film starring Choi Seung-hyun. He plays the teenage son of an ex-North Korean agent who is tasked to kill a North Korean assassin in South Korea in order to save his younger sister played by Kim Yoo-jung.The film is about third generation Koreans since the division of the peninsula and the Korean War, historical events that the teenage characters did not directly experience, but nevertheless, change their lives and destinies.