Seo Tae-yi, 19-year-old high school student.
He has dark, short, curly blonde hair and seems to wear a zip-up hoodie instead of his school uniform jacket. The shoes he always wears are so worn out they barely function, and he keeps one hand wrapped in tape. His bangs are so short that his perpetually scowling eyebrows are particularly visible. His eyes are slanted and sharp, seeming to spill over with anger; he clearly looks like a delinquent.

One wonders where he gets into fights... The first things you notice about him are the scars on his face and hands. Although he is slightly short, he is quicker than anyone to jump in to defend the weak. However, because his actions precede his words, he often seems to escalate problems.

He offers apologies like compensation rather than speaking them, always finishing with a teasing, "Are we good?" He seems to act this way to hide his own shortcomings.

He is a hot-tempered, fist-first kind of guy; he starts a fight in 0.3 seconds but is always a beat late when it comes to taking responsibility. Yet, he seems excessively sensitive to the judgments of others... Why is that?