Cho-won is an autistic but happy young man who loves to draw zebras and run. His mother wants him to feel normal by accomplishing a feat that no one thought his son could achieve. With the help of a coach in exile, she trains him to become a marathon runner.
Despite their different family backgrounds, four friends grew up together in the wearisome years of the 70s. But as time goes by, each of them takes a different life path.
Detective Kang gets involved with a drug business to pay the medical bill of his comatose wife. Min-woo confesses to Kang that he has killed his wife, who knows his past. Slowly, Kang realizes his wife's incident and Min-woo are connected.
A U.S. soldier comes to Korea and tracks down his biological father in jail.
