Knowing Bros is a South Korean variety show which features the main cast acting as students in a High School concept and Korean celebrities guesting as the "Transfer Student".

Jung-Min is an aspiring singer/songwriter with severe stage fear. Na-ra used to be a member of an Idol group. Na-ra has always been Jung-Min's crush. This musical drama shows how they fall in love and best their fears.

Ho Goo Hee, a high schooler and self-proclaimed pushover, discovers a new application on her phone that offers to take revenge on anyone whose name she writes in it.