It tells the story of two Catholic priests involved in the incident and a series of stories that unfolded. Kim Priest (Kim Yun-shik) is excluded by other priests because he always acts without permission, and in order to save the young girl Young-shin (Park Su-won) who is in crisis due to a mysterious traffic accident, in the face of everyone's opposition and suspicion, made a dangerous choice and planned all the actions alone. The deputy priest Cui (Jiang Dongyuan), who was born as a seminary student, was once a bad student who cheated and drank alcohol, but he had all the conditions to help the Kim priest, so he joined the Kim priest's plan to help him save the girl. He did not believe in what the King Priest had done, and while helping him, he also took on the task of spying on him, performing dangerous rituals with the King Priest, but was involved in unexpected mysteries.