Season 1: In his second year of high school, Gu Do-hoon, who suddenly transferred to the school, is bullied for no reason, but his interest is only directed towards his classmate, Jeong Yu-won.

Yu-won is increasingly drawn into Do-hoon's incomprehensible behavior, but an unpleasant incident occurs and the two break up. The two meet again as team leader and employee after becoming adults. Yu-won puts aside his discomfort and is once again drawn to Do-hoon, whose true feelings he still cannot understand, but somehow he feels different from the Do- hoon he knew.