Heesu likes his childhood friend, Chanyoung; Chanyoung is straight and knows Heesu like him, but he wishes he could just be friends with Heesu. Seung-Won is Heesu's neighbor, and Seung-Won has a crush on Heesu. A rumor spreads that Heesu is good with dating advice, because he listens to Chanyoung's problems, and Seung-Won decides to ask Heesu for dating advice in order to get closer to him. Seung-Won pretends to like Jiyu, his childhood friend, in order to keep talking to Heesu. Eventually Heesu starts liking Seung-Won, but things get complicated because Heesu also likes Chanyoung, and he still thinks Seung-Won likes Jiyu. Ultimately, Heesu confesses to Seung-Won and they get together.
The secondary couple is Sunwoo and Dahm-hyung. Sunwoo likes Dahm-hyung and gets Heesu to help him in trying to seduce Dahm-hyung. Dahm-hyung is closed off because of his past, but wants to escape his parents’ loomingness. He obviously likes Sunwoo, but can’t come to accept these feelings. Eventually they kiss and end up together. Side story derails that, but fixes it at the end.
Heesu in Class 2