When they first met, he rescued her, kidnapped her, and helped her pay off her debt. In the name of repaying the debt, he lived under the same roof with this "ice and fire". The series of things that happened next made her overwhelmed. "Even if you don't tell me, I will definitely find out who that person is!" What kind of secrets are hidden behind their protection of her? "This is for you. If you lose it, you will die!" Who is this mysterious person? ?