Lauvil's manga / #Mob Character(1)

Hilarious! The MC discovered he lives inside a BL-manga world and everyone around him are protagonists of their own BL manga. His brother, his friends, classmstes, coworkers, strangers on the street, the delivery man. Determined not to become a BL protagonist himself, he studies BL, learns the rules and flags (and explaining them to the reader) so he can avoid and dismantle them and stay a mob character.