The current format (from episode 17) explores the high school concept where the cast members act like students in a classroom while guests come as newly transferred students. Most of the segments for this format portray activities that every student would do with their classmates. Subsequently, the program sometimes diversifies at the end with a segment outside of the school concept. This format has received praise from the viewers and led to a significant increase in ratings and popularity of the program.
A notable aspect of the show is the usage of the banmal (Hangul: 반말; “informal language”) manner of speech used by everyone regardless of their age or seniority, thus disregarding the Korean language’s strict seniority rules with spoken language and the sunbae–hoobae hierarchy in the Korean entertainment industry. The informal speech and casual setting also encourages the guests and cast to interact with each other as schoolmates often do, leading them to be comfortable enough to tease one another.
There are at least two permanent segments, which have defined the Brother School format: