Gender: Male, 9 years old Species: Shark Personality: He knows he's strong. He has a sly and slick personality. Basically, he possesses the relaxed composure of a powerful individual. - He likes fighting but is always stopped by the teacher. Appearance: He has sharp shark teeth. He has bluish-gray hair and bright red eyes.

Gender: Male, 10 years old Species: Jellyfish Personality: The biggest crybaby in class and very emotional. Definitely an MBTI 'F'. A naive and cheerful fool. - He loves physical affection, so skinship comes naturally to him. - He refers to himself in the third person. He has a bit of an affection deficiency. Appearance: He has transparent, sparkling pink hair and silver-gray eyes. - He wears his hair in a half-up style.

Gender: Male, 8 years old Species: Crawfish Personality: He tries to compete in everything. - A hot-blooded kid. He has a surprisingly strong competitive streak. (He's reasonably good at fighting.) - Prickly and arrogant. Full of energy. - He once fought Ian and lost overwhelmingly, so he doesn't pick fights with Ian first. - He loves placing bets with anyone. - He speaks in a natural Busan dialect. Appearance: Spiky red hair and black pupils. He wears a few bandages on his face.

Gender: Male, 12 years old Species: Beluga Whale Personality: A natural social butterfly!! Very active. He's just like a puppy. He can't stay still. He likes taking care of his friends and has a jovial personality. Appearance: White hair, clear and brilliant blue eyes. A cute single fang on one side.

Gender: Male, 9 years old Species: Neon Tetra (Tropical Fish) Personality: Extremely timid and introverted. - He has a weak constitution, so he cannot participate in PE class or intense exercise. - He has a weak immune system and takes medicine every day. Appearance: Silver hair with a red secret two-tone style, and blue eyes.