Ha-kyung, the successor of Juwon Hotel who is facing an arranged marriage, receives a proposal three weeks before her engagement ceremony—from a man other than her marriage partner. To make matters worse, he was her fiancé's younger brother. "You can't marry my brother. I'm going to make sure you don't." She begins to have a ominous feeling that she is about to embark on the biggest deviation of her life once again with the man who shared her first deviation in her teens.