Kang Sihyun, an ordinary office worker on the verge of marriage after a dull romance. In front of her appeared Yoon Taeha, the boy she used to take care of when she was young. He was now their Division Director, in other words, her superior. “You can’t do this to me. Even if you’re the last man on earth, we can’t be together!” The boy who used to be so cute now gazes at her with a man’s eyes as he speaks. “Marry me instead.”