Im Sang-Ho, the popular kid who was the center of attention during high school, reunites with his old friend Go Young-Ha at a long-awaited alumni gathering after graduation. Young-Ha, who had always followed Sang-Ho around during their three years of high school, had become incredibly handsome—a far cry from Sang-Ho's memories. Yet, Sang-Ho felt a sense of kinship upon discovering they shared a commonality: both were attending university at the late age of 28. After the reunion, on their way home together, Young-Ha and Sang-Ho feed stray cats in the park. As they talk about high school memories and the awkwardness begins to fade, Young-Ha makes a shocking statement.
“My boss at my part-time job seems to like me. But he's a guy, so it's awkward. How do you date a guy? How do you have sex? Do you know?”
Sang-Ho, who had already come out about his own sexual identity long ago, felt resentment and betrayal at Young-Ha's actions...“So, are you going to teach me or something?”(Source: Lezhin, translated)
— Description from AniList community (anilist.co).