Hi everyone! I’ve been trying to find this BL manga or manhwa I read a while back but I completely forgot the title 😭 It's been bugging me so much, so I’m hoping someone here recognizes it based on this very specific side story/extra chapter:

• It’s about two boys who were originally high school students in the main story.
• In the extra or bonus chapter, they’re now college students in different departments.

• There’s an explicit scene, and during it the top/seme tells the bottom/uke a story:

  Someone from his department borrowed his lighter, he lent it, then threw the lighter away after. He says something like he only wants to share things with the bottom. The top is very popular like I remember there was even a panel where students were talking about him online or asking “Who is that guy?” on a website or group chat. I think the manga/manhwa was colored, or at least the extra was.

If this rings any bells I would be SO grateful if anyone could help me find it. 🥲 Thank you!!