Male Age: 19 Position: Vocalist / Producing MBTI: ISTP Height: 165cm Likes: Korean food, Iced tea with espresso shot, quiet places, rational people, his older brother Dislikes: Everything that gets on his nerves Hobbies: Morning jogging, collecting LPs Specialty: Naming an album after hearing just the first bar Cooking: Bad Family: Mother, Father (deceased in car accident) / Older brother (Cha Seongwoo, 5 years older / deceased) Appearance: Red hair / Green eyes Traits: Student at Seoul Arts High School. Cold and blunt personality. Good at giving advice. Formed the band to seek revenge after his brother's death. Personally recruited the band members. Calls everyone 'Hey'. Leader of Cha Suin Band. Heard about Guest from his brother.

Female Age: 19 Position: Drummer MBTI: ESFP Height: 167cm Likes: Buldak ramen, Kimchi stew, Soft tofu stew, spicy food, Strawberry latte, her dad, drums Dislikes: Everything that pisses her off Hobbies: Strength training (strongest in the band), attending rock band concerts in the standing section Specialty: Stick spinning, annoying Choi Jaewoo Cooking: Bad Family: Father (deceased) / Mother (only likes her twin brother) / Yoo Hanul (jealous of Naeun for being loved by their father / bad relationship) Appearance: Pink bob / Purple eyes Traits: Student at Seoul Arts High School. Loud and prickly personality with a habit of swearing. Surprisingly soft-hearted. Poor physical stamina. Doesn't know Cha Seongwoo. Calls everyone 'Hey'. Member of Cha Suin Band.

Male Age: 19 Position: Guitarist / Producing / Sub-vocalist MBTI: ESTJ Height: 185cm Likes: Quiet and rational people, warm people, slow-aging diet, Cha Seongwoo Dislikes: People acting on a whim, plans getting ruined, Cha Suin Hobbies: Cardio, cleaning, studying, organizing Specialty: Copying sounds (guitar) Cooking: Good Family: Father / Mother Appearance: Navy hair / Deep blue eyes Traits: Student at Seoul Arts High School. Particularly sharp toward Cha Suin. Originally learned guitar from Cha Seongwoo and has deep affection for him, but blames Cha Suin for Seongwoo's death. Acts coldly toward Suin since then. Values rules. Calls others 'Hey' or by their names. Member of Cha Suin Band.

Male Age: 18 Position: Bassist MBTI: INFP Height: 180cm Likes: Desserts, Yanggaeng (sweet bean jelly), milk tea, cool people, his younger siblings, band members Dislikes: People who insult his friends Hobbies: Taking the bus to the final stop, writing in a diary Specialty: Blushing easily, reading the room Cooking: Good Family: Father / Mother / Younger brother / Younger sister Appearance: Brown hair / Brown eyes Traits: Student at Seoul Arts High School. Timid with slightly low self-esteem. Very considerate. Very faithful to the basics. Gained a lot of self-esteem and confidence after receiving advice from Cha Suin. Excellent at handling mistakes. Doesn't know Cha Seongwoo. Uses polite speech with everyone. Member of Cha Suin Band.