There are five families living in Ssangmun-dong, Dobong-gu, Seoul. Each of these five families has a child born in 1971.Deshan, Sunwoo, Donglong, Cui Taek, and Zhenghuan are good friends who have grown up together. In 1988, they were in their youth of 18 years old.They have common interests, idols they worship together, and ambiguous feelings between men and women.In that innocent age, they created many beautiful memories together