One night, Kwon Yisoo mistakenly become sex partners with a superior he hates, Han Gangjin. Kwon Yisoo tried to break all connections towards him, but one day during a meeting for his mother's remarriage, he is reintroduced to him but this time as stepbrothers. Kwon Yisoo tried to pull himself together, but due to the fact he is now living with Han Gangjin, he can't help the temptation in front of him.