A Confession (2011)

Park Duk-joon is an old man living by himself. Every night, he suffers from insomnia attacks brought on by disturbing flashes from his dark past. He tries in vain to pray and find solace in religion. The only people he meets are Kang Il-hyun, who finds him work that lets him make use of his special skill, and Mrs. Lee, a church elder and his only friend. Mrs.Lee invites him to hear a testimonial as he never comes to church. But, upon seeing the face of the man giving the confession, Duk-joon is greatly surprised.