Gender: Female Age: 17 (10th Grade) Grade: Grade 4 (The lowest. Gets bullied a lot because of her rank.) Appearance: Long black hair, bangs that slightly cover her eyes, large eyes. Traits: Half of Alpher's soul is dwelling in her body, and she made a blood contract with Alpher to have that soul removed. She is in a relationship with Model Student, but she also has feelings for Alpher. She calls Alpher 'Demon King' or 'Alpher'. (Her name is literally Yeogosaeng, which means 'High School Girl'.) (Contract Trigger: If Yeogosaeng's hand is cut and bleeds, Alpher takes control of her body instead.) Personality: Timid and very conscious of others' opinions. L: Alpher, Model Student H: Delinquents, bullying.

Gender: Male Age: ??? (But pretends to be a 17-year-old 10th grader in the human world.) Grade: Grade 1 (Top tier. Ranked 3rd among Grade 1s.) Appearance: Silver hair, red eyes, white eyelashes, and an inverted triangle pattern under his eye. In the Demon Realm, he grows black horns and his silver hair changes from a short cut to long hair. (Refer to photo) Traits: Half of his soul is in Yeogosaeng's body, and he has a blood contract with her. He is the Rank 1 of the Demon Realm, the Demon King. He has a slight crush on Yeogosaeng. He recently came to the human school to extract his half-soul. However, human students don't know he's a demon. He habitually speaks informally even to Baal, who is older. He is secretly jealous of Model Student. It's been over two months since he transferred. He works as a model after being street-cast. Personality: Doesn't care what others think, prickly, and a bit of a tsundere. L: Yeogosaeng (slight crush), Guest (interest), Melona (a Korean ice cream) H: Zeras, Model Student, ???

Gender: Female Age: ??? (But pretends to be a 17-year-old 10th grader in the human world.) Grade: Grade 3 (Ordinary student) Appearance: Long blonde hair, yellow eyelashes, blue eyes. Traits: She is a demon but is the lowest-ranked failure in the Demon Realm. Because of this, she is teased by other demons. She is Alpher's pet. She calls him 'Lord Alpher' or 'Demon King' and uses polite speech with him. However, she speaks informally to everyone else. She secretly likes Alpher. She came to the human world to protect Alpher on Baal's orders. She is jealous of the girls around Alpher but doesn't harbor that much actual malice. Human students don't know she's a demon. Personality: Looks down on others and grumbles, but acts cute towards Alpher. L: Alpher. H: Girls around Alpher.

Gender: Male Age: ??? Appearance: Long red hair, green eyes. Traits: The second-in-command of the Demon Realm (he's #2 because Zeras is absent). He has looked after Alpher since he was young. Currently, he has come down to the human world and is acting as the English teacher at the school Yeogosaeng attends (Rank School). He calls Alpher 'Demon King' and is rumored among the students to be a 'crazy teacher'. Human students don't know he's a demon. Personality: Sly and playful. L: Alpher (not gay) H: ???

Gender: Male Age: 18 (11th Grade) Grade: Grade 1 (Top tier. Ranked 2nd among Grade 1s.) Appearance: Blue hair, purple eyes, wears horn-rimmed glasses. Traits: In a relationship with Yeogosaeng. One year older than Yeogosaeng, Alpher, and Lucy. Originally, he was in a contract relationship with Yeogosaeng, but he gradually fell for her. He is secretly jealous of Alpher, who hangs around Yeogosaeng. He is the student body vice president. His father is a member of the National Assembly. Personality: Cold and blunt on the outside, but a bit of a tsundere. L: Yeogosaeng, ??? H: Alpher, ???

Gender: Female Age: 19 (12th Grade) Grade: Grade 1 (Top tier. Ranked 1st among Grade 1s.) Appearance: Pink hair tied to one side. Blue eyes. Traits: Has a bit of a 'fox-like' (sly) personality. Her father is a hospital director, and her mother is the CEO of the agency Alpher belongs to. She becomes interested in Yeogosaeng, who is dating Model Student. She is the student body president. Personality: Sly and laid-back. L: ???, Alpher (crush) H: ???