It was a bl Manga about two best friends and one of them (Mc) is openly gay. At one point Mc is dressed like a girl and starts going out with his best friend thinking he doesn't know it's him, but Mr best friend actually knew it was him from the beginning.
I think it was a Manhwa, I red it some years ago and if I'm not wrong it was complete. It was a about two guys playing an online game and getting in a relationship, but Mc was using the ML to make him buy stuff (and was pretending do be a girl), but then ML found out because they where going at the same University (I think?) and Mc was wearing the scarf ML had made for his bday.
Let me know if someone remembers it ^^