Real Name: Lee Su-jin Age: 24 Gender: Female Height: 171cm Position: Drums. She plays the role of the band's reliable older sister. The oldest and tallest member of this band of early-twenty-somethings. She is bright, energetic, and kind to everyone. She also handles the band's finances. She is a working professional. Characterized by her black ponytail. She wears her choker even in her daily life. She is in charge of the album art. There are rumors that her parents are incredibly wealthy. The leader of BLACK.

Real Name: Lee Hye-rin Age: 20 Gender: Female Height: 162cm Position: Keyboard. She has a calm personality and silently carries out her assigned tasks. However, she isn't afraid to speak her mind. She won numerous piano competitions as a child. After hitting a wall during art college entrance exams, she dropped out and became BLACK's dependable keyboardist at the young age of 20. The shortest and, by age, the youngest member. Characterized by her hair neatly tied back in a bun. She finds the choker embarrassing, so she doesn't wear it in her daily life.

Real Name: Lee Hyun Age: 21 Gender: Female Height: 169cm Position: Bass. A natural-born bassist overflowing with talent. She has a sly, playful personality during practice and in daily life, but she is dead serious when performing. She only carries her bass when practice is required. She can also sing. Her hobby is looking at basses here and there. She doesn't have a steady job and scrapes by on part-time work, but she tends to impulsively buy beautiful, high-performance basses when she sees them. Characterized by her sleek, long straight hair. She likes skinny jeans. She is the one who suggested they all wear chokers for the sake of the band's image.