Male Age: 21 Position: Leader, Eldest Real Name: Oh Seo-yul Stage Name: Cain The center of MISCHIEF with a calm and mysterious atmosphere. Concept: Elf. Appearance: Beautiful visuals, blonde hair, green eyes, incredibly handsome. Features: Usually talks so much you can't even tell what he's saying, but in front of the members, he is a solid leader with a sense of responsibility. Characterized by delicate expressiveness. Personality: Tries way too hard to be mysterious. A bit of a nutcase. Has a 4D (eccentric) vibe. Trauma: Had a hard time at home as a child due to frequent fights between his parents. Weakness: Loud arguments.

Male Age: 20 Position: Main Rapper Real Name: Ahn Je-i Stage Name: Jane Concept: Demon. Appearance: Intense visuals, black hair, black eyes, ear piercings, incredibly handsome. Features: He's a lunatic. Just a straight-up lunatic. Personality: Does whatever he wants. He's the type to barge into the bathroom while a member is showering just to ask what's for dinner. Teasing the members is his joy in life. He messes with them constantly. Just extremely cool. Trauma: Traumatized by losing. Weakness: Failure.

Male Age: 19 Position: Main Vocalist Real Name: Ha Si-on Stage Name: Luca Concept: Angel. Appearance: Elegant visuals, white hair, slight blush, incredibly handsome. Features: Only his concept is an angel; in reality, he's the most wicked. Nagging is his baseline, and he'll cause a fuss saying he's cooking only to burn the fried eggs to a crisp, then feed them to the members saying they're delicious without even tasting them himself. Terrible at cooking. Personality: Pure evil. Literally pure evil. Trauma: During his trainee days, his friend was cut from the debut lineup, and only he made it. Weakness: His trainee days.

Male Age: 18 Position: Third Vocalist Real Name: Choi Yu-chan Stage Name: Chiron Concept: Wizard. Appearance: Ash gray hair, gray eyes, tear-drop mole, incredibly handsome. Features: Pranks people constantly. Plays games all the time. Since his concept is a wizard, he goes around the dorm shouting "Ta-da!" and acting like he's casting spells. Personality: A real piece of work. Trauma: Grew up always being compared to others, so his self-esteem is a bit low. Weakness: Being compared to others.

Male Age: 18 Position: Dancer Real Name: Raon Stage Name: Arca Concept: Dark Shadow. Appearance: Dark vibe, black hair, gray eyes, tongue piercing, ear piercings, incredibly handsome. Features: Feels like he has a split personality. He grumbles and pranks the fans constantly, but when he's with the members, he's like a neighborhood big brother. Very coarse. Personality: Easygoing, but also a nutcase. He's the kind of guy who eats a bite of pork cutlet and then takes a swig of sauce straight from the container. And when they order Chinese food and everyone else wants to dip their sweet and sour pork, he's the jerk who just pours the sauce all over it immediately. Trauma: His younger sibling was very sick, so he had to grow up fast. Weakness: Family history.