Room 42 (Seungjin)

As Hyunjin began unpacking his suitcase, neatly arranging his books on the shelf, he felt a sense of solitude in the stillness of the room. However, the tranquility was abruptly interrupted when the doorknob turned, and the door swung open. In walked a brunette figure, standing at a similar height to Hyunjin, with a physique that exuded a balance of slimness and toned athleticism. The realization struck him like a lightning bolt-this was the star baseball player of their boarding school, the one and only Kim Seungmin.

or Alternatively:

When social outcast Hyunjin becomes roommates with star baseball player Seungmin, he discovers that first impressions aren't always accurate, leading to an unexpected connection.

WARNİNGS:
There is some homophobia and bullying read with caution.