The mission is to catch the Devil, Kikwang, and punish him for all of his evil. The Dark Prince's punishment will be... to become human. He's... Heaven's victim. Kang Jiyoung, an Angel in training, will be facing the biggest mission that could change her life. So Myungsoo, Jiyoung's partner, who is more advanced shall be guiding and helping her. With a mixture of love and hatred, the mission may go wrong. Who is Heaven's real victim?