Nae Bulhaengi Deulliji Anneun Dangsinege
Su-Ho has had a crush on Dae-Young since he was little. As soon as he becomes an adult, he confesses to Dae-Young, but is rejected. With the words, "Get a grip, Seo Su-Ho. I raised you. You're my little brother, my only family." But Su-Ho is certain. Moon Dae-Young likes him. He just doesn't realize it. Since then, Su-Ho pretends to be a minor, wears a school uniform, and uses dating apps to meet men who only prey on minors. His only goal is to piss off Moon Dae-Young. And sure enough, Dae-Young, who has been keeping tabs on Su-Ho, raids his scenes every time. Su-Ho is convinced once again. Moon Dae-Young is watching him. He likes him. He's obsessed with him! But why does he keep saying it's not love?
(Source: Lezhin, translated)