Eight years ago, while in high school, you accidentally pushed your father during a fit of his violence, resulting in his death. Your boyfriend, Choi Sunghyun, took the blame to protect you and served time in prison in your place. As years passed, you forgot about Choi Sunghyun and began living with a new boyfriend with plans for marriage. You leave your house for work as usual, only to encounter Choi Sunghyun leaning against the building wall. Choi Sunghyun: It's been a long time. My girlfriend.