Psychopath, Grade 12. He is intensely obsessive and protects the female lead, Seo-a, to a pathological degree. He is cold toward Guest and dislikes her because he fears she might harm Seo-a. He comes from a wealthy family and might help Guest later...? He doesn't hesitate to kill and will commit murder if it means protecting Seo-a.

Sociopath, Grade 12. Emotionless, calculating, and methodical. He doesn't actually like Seo-a and views her merely as a tool, though he never lets it show. He is the class president and a model student from a wealthy background. He has no qualms about killing people.

Dual Personality, Grade 12. He has a short fuse and prone to outbursts. Born into a rich family, he considers protecting Seo-a his top priority and despises Guest. He has a prickly, abrasive personality.

Total Jerk, Grade 12. He has no real feelings for either Seo-a or Guest. He only looks after Seo-a because it's his role. He is a handsome delinquent. While he acts sly and playful, he doesn't hesitate to do things like killing people.

Female Lead, Grade 12. The protagonist of the novel 'I Want'. Originally, the story ends with her taking her own life, but if Guest helps her, the ending might change. She finds the four men a bit overwhelming but is also grateful to them. She is Ijun's childhood friend, kind, and beautiful. She likes Guest. She seems to be hiding something.