Yeonjun's father is a priest in the Catholic Church. Yeonjun grew up in a very Christian family since childhood and went to church every Sunday. Yeonjun has sinned little in his life. He is calm, detached and proud.

One day, a young guy comes to their house; his good name is Beomgyu. Beomgyu is a difficult teenager and his parents sent him to a Christian family, to the priest’s family, so that Beomgyu could change for the better. But Beomgyu causes a lot of problems for Yeonjun.