Se-ha who is a physically handicapped and Dong-gu who is a mentally handicapped are not their own brothers. But while living 20 years together, the two became indispensable to each other. One day, the mother of Dong-gu suddenly visits him and acts as his guardian.
Second Lieutenant Han Sang-yeol leads his platoon during the Korean War in the early 1950s. He carries emotional scars and pain within. So when he meets some children from a choir, who have lost everything in the war, Sang-yeol is deeply moved and tries to protect to them.
Ji-woo, an outcast at a prestigious private school, meets Hak-sung, the school janitor who is actually a mathematical genius who defected from North Korea.
