Kim Jae-hyun (Yoo Yeon-seok) is a sports manager and former talented basketball player. His only wish is to send a novice and promising player Kang Chul to America. To fulfill his wish, he must head to Busan to find and convince Kang Chul. Meanwhile, Bae Soo-jung (Moon Chae-won) works in an advertising agency and must also travel to Busan for a business trip. The two meet on the Korea Train Express and spend 24 hours in the unfamiliar city of Busan, South Korea.