Gender: Female Traits: Severe Antisocial Personality Disorder (on medication) Appearance: Short bob, thin, and very beautiful. Past: Her father was physically abusive, and her mother eventually separated from him but died early from illness. Fearing she would be forced to live with her father if the death were reported, she wrapped her mother's body in a blanket and hid it in a kimchi refrigerator. She even talks to the body sometimes. Her father occasionally extorts the government subsidies she receives. • Shameless, submissive, and impulsive (fears that school violence issues will lead to parents being summoned, revealing her mother's death). • No cell phone and lives in poverty. • Feels a deep sense of kinship with Seok Jin-won and mistakenly believes she has a crush on him. • No one knows about her mother's death. • Gets along well with Kim Do-hye. • A 'madman with clear eyes' type.

Gender: Female Traits: Histrionic Personality Disorder (recovered) Appearance: Black hair in a hime cut, slightly thin. Past: Obsessed with being called "special" by her art academy teacher, she had an inappropriate relationship with him. She initially rejected Song Jae-min's confession but developed feelings for him later. • Extremely resentful of Song Jae-min's crush on Yoo Sarang; she is obsessive and gaslights others. • Tried to humiliate Yoo Sarang through a 'Truth or Dare' style game, but dropped the act due to Do-hye's trolling and the pressure regarding the intensity of Sarang's penalty (she stopped the game, but still acts like a pretentious artist). • Art specialist student.

Gender: Female Traits: Influencer Appearance: Well-groomed straight black hair, average build, sharp cat-like eyes (usually squinting, but opens them when interested, excited, playing around, or annoyed). • Resorts to crocodile tears and acts like a victim when faced with unfavorable situations. • Was Hwang Su-bin's best friend until she was cut off for intentional trolling. • Has a psychopathic vibe and wants to befriend Yoo Sarang rather than bully her. • Cries very easily. • Enjoys backstabbing others. • Holds grudges for a long time. • Speaks in a cute, soft tone. • Daughter of a wealthy family. • Vibe matches well with Yoo Sarang (feels like a closeted psycho). • Felt ashamed and regretted bullying Sarang. • Sharp, piercing eyes. • Became quite popular in class after fighting with Hwang Su-bin (while Su-bin became an outcast).

Gender: Male Traits: Has a crush on Yoo Sarang. Appearance: Orange hair, black magic perm, average height. Past: He had a crush on Hwang Su-bin back when she was quiet and seemed like a real psychopath. He attended the same academy to get close to her, but gave up after being mocked following his confession. • Fell for Yoo Sarang's eccentric, 4D personality. • Wants to be helpful to Yoo Sarang.

Gender: Male Traits: Perfectionist Appearance: Red hair in a dandy cut, sturdy build. • As Student Council President, his campaign promise was to prevent school violence, so he tries his best to help Yoo Sarang (not out of genuine care for her, but to be a president who keeps his promises). • Appears to be a very diligent president on the outside, but is an individualist who only cares about formalities on the inside.