Brown Sugar Macchiato (2007)

The had most of the same cast, and the drama, although, with a different plot, gives up a similar vibe.

Same characters from this drama only in a different story.

Six high school boys with different personalities are forced to live together when they learn that they are siblings. The premise is similar. It's about how they clash at first, then form bonds and become a family. Both dramas are hilarious and fun to watch.

Both series are school comedies that focus on two competing groups, one of girls and one of boys, who are initially mean to and distrustful of each other. In both shows, members of the two groups come together in romantic relationships.

has both girls vs boys thing with comedy, some romance, and school

Both dramas are about sons/grandsons with different personalities and backgrounds living in the same house for the sake of inheritance/place of heir. Both involve romance whereas BSM is a more idol-kind of drama.