No one ever thought that it would end this way, not her, nor him. She had a burning passion for him, not in a good way, more like a strong hatred you would say. He was clueless, didn't know that his life was at risk and that agents, or angels as he likes to call her, existed in this cruel and dangerous world.

Sohee, an average and innoncent teenage girl, goes undercover to save Kim Taehyung, a man loved by girls all around the world. During the process, he falls in love with her. Will Sohee reject his feelings and leave it as an unrequited love or reciprocate the feelings of the man she hates most?