Geomeun Gul

The adopted son Yu-Jin is more respected than the biological son Tae-Hyeon, who's always getting into trouble. He finds his younger brother, who pretends to be carefree and cheerful, utterly pathetic. Then one day, feeling strange emotions toward Tae-Hyeon, Yu-Jin makes a dangerous choice.. “Brother, if you do it with me once, I'll keep your secret..” (Source: MrBlue, translated)