Although Huang Dayu (played by Park Yong-woo), a university teacher, is handsome and knowledgeable, and can be regarded as a model of a good man, he seems to be destined to lack luck with women. He has never had a serious relationship in his life. Seeing that his age is about to cross the 30-year mark, he can only worry secretly in his heart. By chance, Huang Dayu met the beautiful and intellectual new neighbor Li Mina (played by Choi Kang-hee). He plucked up the courage to propose a date, but Li Mina agreed happily. After a few exchanges, the distance between Huang Dayu and Li Mina became closer and closer. During this period, Huang Dayu began to feel that Li Mina's identity became deliberate. She claimed to be a literature and art lover, but she didn't even know "Crime and Punishment" and Mondrian, and even the name "Li Mina" was fabricated. Who is this woman who suddenly appeared? What is her purpose in approaching Huang Dayu?