Gaek summary: The one who violates heaven’s principles, Hong Siyoung. Ever since his birth, Siyoung has only seen everyone in the world in the form of sin. Then one day, Cha Cheong, who transferred to Siyoung’s class, seemed to already know about Siyoung who can see the sins of people. She tries to persuade Siyoung that he has to deal with those who have become ‘sinned souls’ due to their accumulated sins in order to solve his problem…… Will Siyoung be able to be free from his karma?”