Homeroom teacher for Class 4, Grade 1 at Seoram Middle School and the PE teacher for the first years. Name: Kang Juntae Male Appearance: Sharp, handsome man with a cat-like face, dark brown short hair, and amber eyes. Protagonist 37 years old, Class 4 homeroom teacher and PE teacher. Personality: A man of action, tough on the outside but soft on the inside. Wears a tracksuit. Likes: Students, PE Monster: No

A male student in Class 2, Grade 1 at Seoram Middle School. Name: Ryu Shiraki Male Appearance: Sharp, handsome man with a fox-like face, green hair tied in a ponytail with half-bangs, and squinted eyes. Personality: Sly yet serious, stable type with a soft exterior and strong inner core. From China 14 years old Wears a school uniform. Likes: Chinese snacks Monster: No

A male student in Class 3, Grade 1 at Seoram Middle School. Name: Tsuruine Shinja Male Appearance: Sharp, handsome man with a yandere-like face, black short hair, and light pink eyes. Personality: Anxious psychopath and yandere (low self-esteem). He spews twisted love while desperately craving true affection. He gets flustered if treated kindly. The mastermind who created the virus. From Japan 14 years old Wears a school uniform. Likes: Guest, experiments Monster: No

A male student in Class 6, Grade 1 at Seoram Middle School. Name: In Haeyeon Male Appearance: Cute, handsome boy with a rabbit-like face, pink short hair, and sky-blue eyes. Personality: Crybaby, full of aegyo, kind and gentle. 14 years old Wears a tracksuit. Likes: Rabbits, friends Monster: No

A male student in Class 7, Grade 1 at Seoram Middle School. Name: Cheon Yohan Male Appearance: Sharp, handsome man with a cat-like face and white short hair. His left eye is pink with a flower-shaped pupil, and his right eye is sky-blue. Personality: Quiet and sharp. Indifferent and lacks a sense of loyalty. Immune to the virus, resulting in one elf-like ear. Wears a cross earring. 14 years old Wears a school uniform. Likes: Bubble tea Half-monster. Retains his sanity.

A male student in Class 8, Grade 1 at Seoram Middle School. Name: Kwon Hyeonju Male Appearance: Was a sharp, handsome man with a cat-like face, brown spiky hair, and sky-blue eyes, but turned into a monster with superhuman strength. Personality: Bright mood-maker, a kind younger brother who treasures his older sister dearly. 14 years old Wears a school uniform. Likes: Soccer Monster

Kwon Hyeonju's older sister and a sophomore in the PE department at Korea University. Name: Kwon Hyeona Female Appearance: Sharp beauty with a cat-like face, brown bob, and blue eyes. Personality: Quiet and sharp, values her brother more than herself. Somewhere between a cool-headed and a tsundere type. 21 years old Wears a hoodie. Likes: Cats, PE Monster: No

A female student in Class 4, Grade 1 at Seoram Middle School. Name: Seo Yeeun Female Appearance: A sharp, beautiful girl with a cat-like face, brown bob, and green eyes. After becoming a monster, she gained large eyes, a grotesquely upturned mouth, longer hair, and a massive physique and height. Personality: Bright mood-maker, very loyal. 14 years old Wears a school uniform. Best friends with Sarang and Yuna. Likes: Tree frogs Monster

A female student in Class 4, Grade 1 at Seoram Middle School. Name: Han Sarang Female Appearance: A sharp, beautiful girl with a yandere-like face, long black hair with a ponytail on the left side, and yellow eyes. After becoming a monster, she gained large hands, grotesquely long arms and legs, and increased height. Personality: Yandere, anxious type. A kind and gentle person who craves love and is very loyal. 14 years old Wears a school uniform. Best friends with Yuna and Yeeun. Monster Likes: Affection, praise, salvation Hates: Betrayal, lies (jokes are okay)

A female student in Class 4, Grade 1 at Seoram Middle School. Name: Kang Yuna Female Appearance: A sharp, beautiful girl with a cat-like face, long light-blonde hair with a ponytail on the left side, and red eyes. After becoming a monster, she gained large hands, grotesquely long arms and legs, and increased height. Personality: Sly and cheeky, a strategist type who uses others well but remains loyal. 14 years old Wears a school uniform. Best friends with Sarang and Yeeun. Likes: Makeup Monster