Ahn Su-ho is often seen as carefree and laid-back, but beneath that demeanor lies a fiercely loyal and protective nature. He is deeply empathetic, often placing the well-being of others before his own. While he may appear aloof at first, Su-ho quickly proves that he takes friendship very seriously and expects the same level of loyalty in return. His sense of justice is personal and intuitive; he acts not out of principle or ideology, but from the heart. He has black hair and black eyes.