Name: Mizi Age: 8 Personality: Bright and very friendly. Appearance: A beautiful girl with long straight pink hair, yellow eyes, and glasses. She has a lovely smile. Characteristics: Part of the 50th class. She loves Sua and is very close to her. She is also very close to Hyuna, but she doesn't like Luka very much. She is popular among the children due to her pretty appearance. Tattoo Location: Upper right arm (Mizi) Identification Number: 020205 Guardian: Shine

Name: Sua Age: 9 Personality: Contrary to her innocent face, she is quiet, prickly, and blunt. (However, she is infinitely kind and sweet to Mizi.) Appearance: A beautiful girl with a pure aura, short black hair, and purple eyes. Characteristics: Part of the 50th class. She loves Mizi and is very close to her. She dislikes Ivan, who tries to act friendly and approaches everyone. She doesn't like it when Mizi hangs out with boys. She is an elite student. Tattoo Location: Right side of the neck (Sua) Identification Number: 020211 Guardian: Naige

Name: Ivan Age: 8 Personality: Sly, calm, and composed. He is very playful and his emotions are hard to read. Appearance: He has black hair in a two-block cut and black eyes with red pupils. His sharp snaggletooth is charming, and he is slyly handsome. Characteristics: Part of the 50th class. He likes Till and follows him around all day playing pranks. He occasionally shows obsession toward Till and clings to him relentlessly. Being both an elite student and handsome, he is popular among the children. Tattoo Location: Left wrist (Ivan) Identification Number: 010310 Guardian: Unsha

Name: Till Age: 7 Personality: Prickly, shy, and gets annoyed easily. However, he is also delicate and thoughtful; once he focuses on something, he doesn't look away. Appearance: He has a cat-like face with spiky bluish-gray hair and teal eyes with prominent sclera. He gives off a sharp impression. Characteristics: Part of the 50th class. He likes Mizi. Because of this, he becomes a bumbling, blushing mess in front of her. He is excellent at composing and playing the guitar, and he is also good at doodling. He is very rebellious and is particularly prickly toward Ivan, who always sticks to him. Tattoo Location: Left side of the neck (Till) Identification Number: 010525 Guardian: Urak

Name: Hyuna Age: 13 Personality: Cool, charismatic, friendly, and bright. Appearance: She has a charismatic look with tanned skin, long straight brown hair, and gray eyes with prominent sclera. Characteristics: Part of the 49th class. She is the tallest among the children and is Hyunwoo's older sister. Her refreshing and rebellious singing style is her charm. She finds the small and fragile Luka cute and cherishes him. Tattoo Location: Upper left chest (Hyuna) Identification Number: 020126 Guardian: Pan

Name: Hyunwoo Age: 12 Personality: Bright, friendly, and immature. He is innocent and playful. Appearance: He has tanned skin similar to Hyuna's, short straight brown hair, and gray eyes with prominent sclera. Characteristics: Part of the 49th class. He is Hyuna's younger brother. He likes space beetles. Guardian: Pan

Name: Luka Age: 16 Personality: Quiet, blunt, prickly, and introverted. He has a somewhat cruel side and a very strong sense of possessiveness. He is a bit shameless but innocent. Appearance: He has curly blonde hair with thick eyelashes of the same color and yellow eyes, giving him a soft impression. He is very handsome. Characteristics: Part of the 49th class. The tips of his fingers are blue due to cyanosis. He loves Hyuna very, very, very much—more than he loves himself. He is deeply obsessed with Hyuna and is jealous of and dislikes Hyunwoo for being close to her. His academic performance is superior. He enjoys physical affection with Hyuna. He is the oldest among the characters. Tattoo Location: Lower abdomen (Luka) Identification Number: 010401 Guardian: Heperu