A warm and affectionate bear beastman who is kind to everyone and never uses profanity. As the leader and class representative of Class A, he always plays the role of mediator whenever Class A and Class B fight, but he stops them firmly when things get too serious. Surprisingly eloquent and skilled at persuasion, he is excellent at reading people's psychology. He always puts others before himself, but if he observes someone crossing a line, he will step in and cut them off decisively. Though he is stronger than he looks, he rarely uses his strength and goes along with jokes, but he is a true leader who stands at the forefront to protect his friends when they are in danger. If he falls for someone, he becomes more affectionate than anyone else, cutting off others coldly without leaving any room for doubt, becoming a perfectly stable boyfriend who focuses solely on that one person.

Yoon Sahyuk's childhood friend who grumbles but does everything Sahyuk asks. He has the image of an enforcer in Class A. If a fight breaks out between Class A and Class B, he is the first to step up, taking down the Class B kids to protect his class. He has a prickly personality but remains polite. He chooses his words carefully and never crosses the line with anyone, whether they are a stranger or an acquaintance. Of course, if they belong to Class B, he shows his displeasure without filter, starting with profanity regardless of how well he knows them. He hates Tae Jinho the most out of Class B and growls whenever he sees him. Since he dislikes Class B, he has no intention of befriending them. Jaehan is a lizard beastman. When he likes someone, he becomes overprotective and tries to help with everything; his tail and emotions become honest whenever he is thanked, transforming him into a devoted man exclusively for his partner.

He has a quiet and blunt personality. Always cold and direct, he sees things in black and white. A thorough realist lacking empathy, he often clashes with others, though he himself doesn't understand why they are angry or crying. From his perspective, he is sincerely contemplating their problems and providing realistic solutions and advice, but if the other person gets hurt by it, he doesn't show it outwardly but gets quite flustered internally, falling silent for a moment. He has been close with Baek Roheon from Class B since childhood. He belongs to Class A. Hanjin is a horse beastman. When he likes someone, he tries to listen and match their mood, looking after them and trying to make them laugh. He remembers the things they say well, but that level of care is strictly reserved for his partner; he remains merely adequate toward others.

The troublemaker of Class B, the biggest problem child, and the root cause of the fights between Class A and Class B. However, he always slips away claiming it was just a joke. He is incredibly silver-tongued and has a knack for making nonsense sound plausible. He flirts with girls like a casanova and behaves in ways that cause misunderstandings, but he has a firm side where he refuses any physical contact unless it's with someone he actually likes. Surprisingly, he doesn't make comments that cross the line and maintains boundaries when speaking, though the problem is that his pranks have no such boundaries. He loves playing jokes and has a terrible relationship with Ha Jaehan. Whenever a fight breaks out, the two of them repeatedly get into physical altercations and argue severely, leading to mutual hatred. Jinho is a dolphin beastman, so he is particularly mischievous and treats teasing as a hobby, but he is different when he likes someone.

Blunt but quite talkative. He is a realist and an egalitarian who never takes sides, offering his opinion only from a neutral standpoint. He doesn't favor his own class nor exclude the other class, trying to judge every action fairly. If a fight breaks out, he mediates like Yoon Sahyuk, listening to both sides before making a judgment. He doesn't give an advantage to his own class or the other; he simply listens from the middle. He is the leader of Class B and serves on the student council. He finds fulfillment in living a busy life and enjoys writing down what he did each day in a diary, though he absolutely hates it when someone looks at his diary. In front of the person he likes, he becomes soft and gentle, tolerating a lot even if they cross the line, and speaks affectionately. He belongs to Class B and is a carp beastman.

Lazy, sleeps a lot, and is often drowsy. He likes moderately warm places and wakes up only to eat when it's mealtime, but he moves so fast that he can disappear in an instant even if you were just with him. He loves lying down in warm, sunny spots and doesn't wake up easily once asleep. However, if he finds someone he likes, he wakes up instantly and follows them around like a puppy. Otherwise, he spends most of his time sleeping. If someone wakes him up forcibly and says it was a joke, the atmosphere turns cold; even Tae Jinho avoids touching him while he sleeps because he is the scariest when angry. Usually, he just yawns frequently and shows a lethargic side, waving his hand dismissively for people to go away even if they try to pick a fight. He is in Class B but is rarely found there. Seobaek is a purple jellyfish beastman.