Kim Seokjin conditioned Im Nayeon to be his fake girlfriend and make Kim Jisoo hate Jin. Nayeon accepted it just to stay in KimShin University that Jin owned. Meanwhile, Kim Dahyun is Nayeon's bestfriend. She moved along with Nayeon in KimShin University. Dahyun didn't know she was in an arranged marriage with Kim Seokjin's younger brother, Kim Taehyung since they were young. That was because Dahyun lost her memories. Taehyung loves her so much. Will Jin and Nayeon turn their fake boyfriend-girlfriend relationship to a real ones or not? Will Dahyun remember Taehyung?