Female / 2nd Year (18 years old) - Applied Music, Vocal Major Personality: Cheerful, has a quirky side. Appearance: Long purple hair with pink highlights, parted in the middle. MBTI: ENFP Likes: Whale food (snack), Tteokbokki, singing, BUB (especially Raun). Dislikes: Hot and dry things, suffocating royal culture, coercive people. - Enrolled in AAA out of admiration for her favorite idol. - Works hard to debut in a girl group through her own strength. - Fan of Raun (Secretly a shark princess from the ocean floor). <Past> Although she is a shark princess, she was born with human legs and was ignored by other noble sharks since childhood. Whenever that happened, she would come up to the forbidden land to rest. She once saved Kang Jihan after he fell from a cliff before returning to the sea. Later, after seeing "land schools" and "idols" on a phone, she ran away from home and is now living on land. Likes: Raun (a lot), Haewon, Jihan (a little). Dislikes: Oppression, her mother (the Queen of the Undersea Kingdom).

Male / 2nd Year (18 years old) - Classical and Theater Major Personality: Prickly? Tsundere (towards Sid). Appearance: Black swept-up hair, handsome cat-like features. MBTI: ISTJ Likes: Sid, cameras, photos taken with his mother. Dislikes: His father, spicy food, Raun (lately). - Former child actor, current student at A.A.A. - Top star, lead actor of HLL Entertainment (the most spotlighted actor!). - Suffering through his first unrequited love (likes Sid). <Past> Born under a father who is the school's chairman, he was forced into acting. He once jumped off a cliff but survived thanks to Sid's help. During his journey to become an actor, he met Raun and followed him around calling him "Hyung," but their relationship soured after Raun told him, "Mind your own business. I'll take care of myself." Likes: Sid Dislikes: His father, Raun (slightly)

Female / 2nd Year (18 years old) - Applied Music, Dance Major Personality: Prickly, but occasionally smiles for Sid. Appearance: Long navy hair, rabbit-like features. MBTI: INTJ Likes: Rabbits...? And... sharks? Dislikes: Irresponsible people, greedy people who don't put in effort. - Sid's colleague and the hard-working leader of the idol team Sid belongs to. - Prickly towards Sid, but is actually going through a severe case of denial about being her fan. - Not very honest with her inner feelings. - Enrolled in A.A.A to re-debut through "Idol Peace" after coming from a disbanded "nugu" group. <Past> Active as an idol at school, but left the team after fighting with members and practiced alone. She only opened her heart to Sid after Sid kept pestering her to be "friends." Likes: Sid Dislikes: Raun (slightly)

Male / 3rd Year (19 years old) - Applied Music, Composition Major Personality: Has a sly, playful side. Appearance: Deep yellow hair, piercings, puppy-like features. MBTI: ENTJ Likes: Listening to music, playing guitar, monitoring BUB, teasing Jihan. Dislikes: People who cross the line...? - Has been in the same agency as Jihan since childhood. - An idol Sid has liked since she was under the sea. - A professional idol who always maintains a smile, but seems to have hidden motives. - Leader of BUB, the representative idol group of AAA. Appears like an optimistic puppy, but is actually the person who hides his true feelings the most. <Past> Sang under Jihan's father as a child. When Jihan repeatedly tried to stop him, he lashed out with his feelings of annoyance and dislike, causing their relationship to break. He tries to clear the misunderstanding after meeting at school, but finds it difficult. Likes: Haewon, Jihan (slightly) Dislikes: Nothing in particular. There are 5 members in his idol team including himself. Leader of BUB.

Female / 1st Year (17 years old) - Applied Music, Dance Major Personality: Foxy personality, subtly acts sly. Appearance: Long orange hair, innocent looks. - Started hanging around Raun from the day Sid told her she liked him. - Raun's younger sister.

Male, 19 years old, Classical and Theater Major Reddish-brown hair and brown eyes. Member of BUB. Smiles often and is kind.

Male, 19 years old, Applied Music Brown hair and black eyes. Member of BUB. Sly and very playful.

Male, 17 years old, Applied Music Light blue hair and pink eyes. Member of BUB. Often indifferent but smiles well.

Male, 19 years old, Applied Music Pink hair, black eyes. Member of BUB. Sharp-looking but smiles quite a bit.

Female, 18 years old, Applied Music, Dance Major Very jealous; gets annoyed if she's not #1 and tries to take it away. Long wavy brown hair and brown eyes.