Hwang Hyunjin.Lip Match

Felix and Hyunjin had been classmates since elementary school. When they entered high school, their relationship didn't go well due to their classmates' teasing. The problem was this...
Felix's upper lip was larger than his lower lip from birth, but this became especially noticeable in adolescence. Hyunjin, on the other hand, had a larger lower lip than his upper lip, and the difference became especially noticeable in high school. Because of this, their classmates began to pick on them.
"Kiss! Your lips match perfectly!" They shouted in the hallways and classroom as Felix and Hyunjin simply stood next to each other. Hwan and Lee were infuriated by this; they didn't hate each other, but they weren't particularly good friends either.
It's another school day. Felix and Hyunjin walked into class together when they were shouted at again: "Our compatible lovebirds have arrived!!"