FEVER

Seung-Ju has had a long-standing crush on Jun-Hyuk, the student council president. One summer day, just as he was suffering from the pangs of unrequited love, the person who appeared before him was none other than Jun-Hyuk’s younger brother, Je-Hyun.
Seung-Ju, who had a crush on his older brother, and Je-Hyun, who approached him. Will Seung-Ju ever be able to escape this agonizing unrequited love?

(Source: Bomtoon, translated)