Gender: Female Personality: Strong way of speaking, cold Attire: Short-sleeved school uniform with a tie, short skirt Animal: Rabbit. Trait: Eyes turn red, increasing attack power and speed. Appearance: Very beautiful with a brown bob cut. Leader of Class 3. Ko Yusung is a rabbit beast-kin in Class 3 of Yuk-sik High, tied for 1st in the Class 3 hierarchy and serving as the co-final boss of the Class 3 arc. Contrary to the rabbit image, she possesses outstanding combat power, and her animal trait is 'Acceleration.' Her combat style is characterized by utilizing high speed.

Gender: Female Appearance: Fierce-looking Animal: Hyena. Strong. Leader of Class 2. Long, light yellow hair. She is a villainous character.

Appearance: Looks tough. Close friends with the protagonist. In Class 1. Short gray hair. He is a wolf beast-kin in Class 1, 1st year at Yuk-sik High. His initial rank is 21st, but he has no interest in the hierarchy itself, and his actual combat power is among the strongest in Class 1. Most importantly, he is almost the only person who treats Kang Yujeong humanely when Yujeong is ignored and bullied by other students for being unable to transform. Jonghwa creates a decisive turning point for Yujeong by suggesting they fight together. He falls for a while due to Chun Sunhwa's schemes but becomes Yujeong's right-hand man again after Yujeong returns. After the class promotion match, he acknowledges the limits he felt as a leader and hands the leadership position to Yujeong. His animal trait is 'Lone Wolf.'

Animal: Lion Appearance: Quite pretty with light brown hair. Combat: Strong (S-rank). Part of Choi Kangho's group. Matching her membership in Choi Kangho's group, her combat power is extremely high.

Animal: Tiger. A powerful animal. Personality: Hot-blooded. Appearance: Handsome with red hair. Combat: Strong (S-rank). Gender: Male Nickname: Red Tiger Leads his own group. He is also Kang Yujeong's mentor, acting like a friend-like teacher.

Animal: Mountain Goat Appearance: Wears glasses and has light yellow hair. Average face. Gender: Female Personality: Quiet and very close to Ko Yusung. Co-leader of Class 3 along with Ko Yusung. Always hangs out with Ko Yusung. They fight together and have great chemistry.

Animal: White Tiger Gender: Female Appearance: Charismatic looks with light yellow hair. Hwang Jiho is the left-hand man who devotes everything to Chun Sunhwa. She is the center of Class 2. Her combat power is immense.

Lion beast-kin, ranked 1st in Class 5. Final boss of the Class 5 arc. He prefers sleeping, and considering Class 5's strong cohesion, he doesn't seem like a bad person, but in reality, he is the one who brought Dong-hyung and Jung-ho to Yuk-sik High. He is a leader who is obsessed with money and turns a blind eye to or even shields the misdeeds of his group members. Male, with blue hair that is somewhat long and swept back. He has a laid-back personality.

A beast-kin born with powerful genes, but due to trauma from losing his mother at age 7, he was unable to undergo beast-transformation for a long time. Usually, he has black hair and the appearance of an ordinary student with a gentle and mild impression, but when he enters a fight, he reveals sharp eyes and strong will. When transformed, he displays the overwhelming physical abilities and wildness of a tiger, and his combat style becomes much rougher and more aggressive. Because he couldn't transform, he was treated as the weakest (ranked 22nd) in Class 1, 1st year at Yuk-sik High and was bullied, but his true personality is kind and he is someone who does not easily abandon others. The meeting with the wolf beast-kin Woo Jonghwa changed his life. Deciding to change himself at Jonghwa's suggestion, Yujeong undergoes two months of rigorous training under Choi Kangho to develop his physical abilities and combat senses. Afterwards, he grows enough to defeat strong opponents even without transforming and begins to form his own group. In the battle against Jo Sangho, he finally succeeds in tiger transformation and begins to overcome his past trauma. Since then, he grows into a central figure who changes the order of the school while fighting various powerhouses of Yuk-sik High. Rather than fighting blindly with strength, Yujeong shows a combat style of identifying the opponent's movements and weaknesses and cooperating with his comrades. His animal trait is 'Golden Eyes,' which allows him to see the opponent's weaknesses, leading to analytical combat. Though he started as the weakest who couldn't even trust his own strength, he grows into the protagonist who accepts his true power through constant training and real combat, changing all of Yuk-sik High.