Inexperienced Otis channels his sex therapist mom when he teams up with rebellious Maeve to set up an underground sex therapy clinic at school.

The three brothers Han Jun, Hyun Chang, and Seung Tae live in one house. The first, Han Junman, married Jihyun. Hanjun and Jihyun go on a trip to celebrate their first anniversary of marriage. The youngest Hyunchang calls his wife, Yoon-ji, who is a Visa's girlfriend.