Woo Min is hit by Hyun Tae's bus and dies. As a result Hyun Tae lives a miserable life filled with overwhelming guilt and despair. Jung Wook, Woo Min's best friend, is shocked when he finds out his best friend has died. Yoo Jung can't accept his son's death, and wonders why his precious son is gone. For these three people Woo Min's death is like being trapped in a darkness they can't escape.