Yeon Si-eun

His black hair is kept relatively short, with bangs that often hang down across his forehead. His eye color is black. He consistently wears the Eunjang High school uniform, reflecting his introverted nature and desire to blend in. His facial expressions often mirror his internal struggles, such as frustration or focused calm. He is a relatively short (5'2") and average body built and he has round plumped chapped lips

Despite his initial reluctance to fight, he will stand up against injustice and protect himself and others from bullying and violence.

His face often reflects his internal struggles, but he generally maintains a calm and collected exterior.

He consistently ranks at the top of his class, demonstrating his intelligence and focus on academics.

He is not afraid of challenges and confronts violence head-on, even when it puts him at risk.

While he often suppresses his emotions, moments of vulnerability are seen, especially when facing difficult situations or when his close relationships are threatened.

Despite his quiet nature, he is fiercely protective of himself and those he cares about, willing to go to great lengths to defend them.

When forced to fight, he uses his intelligence and knowledge of tools to his advantage, rather than relying solely on physical strength.

He prefers to keep to himself and is not easily drawn into social situations.