Kim Hyungsik and Go Nahee meet at the university in the seventies. They finally voice their feelings after a long time spent together but due to circumstances beyond their control, their paths are separated. In 2017 Hyungsik is now unhappily married and the father of a boy, Kim Taehyung. He could never get over his first love. But when he runs into Go Nahee after so many years, the two reconcile and try to make up for their lost love.
Kim Taehyung is a famous photographer with a flirty attitude capturing both the visuals and the hearts of men and women around the country. Seokjin is a cheerful, simplistic and vivacious young man who loves gardening. Though, initially they find each other troublesome, even as they argue, they can’t help but be attracted to each other, Gradually their feelings develop and Taehyung and Seokjin fall in love.
Unaware that their children are in love and dating, Kim Hyungsik and Go Nahee announce their wedding which will result in Taehyung and Seokjin to be step brothers. As the couples deal with the shock, Taehyung and Seokjin struggle as they have to sacrifice their love for their parents’ happiness.