A journey to seek for forgiveness. A middle school girl is murdered on the way back home from church. Catholic priest PARK feels guilty for the incident and visits her sister Soo-hyun to give his condolence. Sharing the same sadness and grief, both slowly feel for each other until they enter into an unavoidable relationship. After spending several nights together, priest PARK falls into the deepest agony. Having realized the nothingness of love, he leaves for Peru to find his best priest friend and confess his sin.