"Hyung~"
Dae-hyun sighed. It was the resigned sigh of someone who knew doom was coming, and couldn't do anything about it. At the moment, doom was 5'11" of lanky teen, wearing the world's most eager grin, running full speed at him. The sight reminded him of nothing so much as an over-enthused dog, much too big to be lifted anymore but still just as willing to jump into your arms.
In other words, his brother--- his real, biological younger brother, Kim Dong-hyun.