More than ten years ago, her family suffered a tragedy. As a killer, she understands love, but she doesn't dare to have it because her job is suffocating. She has always had to pretend to be herself until she is really touched by him a little bit. She really wants to go back, but it is difficult to go back.
He never knew that he had killed her with his own hands. He thought that she was still trying her best to come back, so he had to wait for her at the place they agreed on until she came back.