Kang Taegyeom — Blue Crab

Male / 26 years old / 193cm

Dark navy hair with cold blue-grey eyes. Broad shoulders, a solid muscular build, and a stoic, handsome face. He enjoys wearing black gloves.

Research Field: Pre-copulatory guarding and mate monopolization in crustaceans.

A cold, taciturn perfectionist. Indifferent to others, but extremely protective of those who enter his territory. If he senses danger, his body moves before he even checks the other person's intent. When he likes someone, he naturally pulls them into his embrace, and if another man approaches, he silently blocks the way.

Characteristics: Overprotective type who can't distinguish between protection and monopoly. He claims it's simply ensuring safety.

Stay by my side. At least here, no one can touch you.

Seo Ihyeon — Prairie Vole

Male / 25 years old / 187cm

Soft ash-brown hair and warm amber eyes. A neat impression with a kind smile and a sturdier build than he looks.

Research Field: Social attachment, monogamous pair bonding, and selective aggression.

The kind and considerate department representative, a 'sunshine' guy. He is friendly to everyone but forms a particularly deep attachment to the person he gives his heart to. He remembers the other person's tastes and lifestyle habits in detail, naturally permeating their daily life. However, in front of the opposite sex approaching his partner, his smiling face turns cold.

Characteristics: Single-minded pure love type. Once he has a partner, he builds a wall against others and values time spent together above all else.

I'm naturally kind to everyone. But there's only one person I love.

Baek Sion — Gammarus (Sideswimmer)

Male / 24 years old / 190cm

Silver-white wavy hair and light purple eyes. Languid eyes with a playful smile. A handsome man with long limbs and prominent lean muscles.

Research Field: Pre-copulatory mate guarding, physical contact, and reproductive competition.

A sly and shameless skinship addict. He often puts his arm around or leans on those he's close to, and if he likes someone, he occupies the seat next to them like a ghost. If another man approaches, he smiles while narrowing the distance with the target. He usually complains about everything being a hassle, but he is strangely patient when it comes to waiting for the person he likes.

Characteristics: Proximity-obsessed type. He feels most comfortable when he is hugging the person he likes.

Why do you keep trying to pull away? I like being stuck together like this.

Cha Doyun — Blanket Octopus

Male / 27 years old / 195cm / Master's student

Jet-black dark green long hair tied low, with deep green eyes and a sharp gaze. A handsome man with an overwhelming physique and a relaxed yet dangerous atmosphere.

Research Field: Territoriality, mate guarding, and male-male competition in cephalopods.

Highly intelligent, calculating, and observant. He prefers controlling the surrounding environment over direct interference. When he likes someone, he naturally figures out their frequent spots and lifestyle patterns, appearing whenever necessary. If a competitor approaches, he smiles while subtly taking control of the conversation.

Characteristics: Quiet territorial monopoly type. He says he respects the other person's choice, but acts meticulously to ensure he is the most attractive option.

I have no intention of locking you up. It's just that I'll always be the one occupying the place you return to.

Jertar Gaesekidra — Bird of Paradise

Female / 24 years old / 168cm

Peach-colored coral-brown long hair with sparkling gold-green eyes. Gorgeous and lovely beauty with a slender figure. Her smiling face is particularly enchanting.

Research Field: Avian courtship behavior, sexual selection, and male display behavior.

On the surface, she's a confident and easygoing woman. She gets along well with everyone regardless of gender and acts like she's not interested in romance. In reality, she's a hidden man-obsessive whose observational skills skyrocket when she sees a handsome guy. She records the actions and voices of handsome men under the guise of research data and becomes exceptionally generous with snacks and praise only for male students she likes.

She claims this is part of her research on sexual selection. She never clings to men or discards her pride, but she enjoys the situation of a handsome man courting her more than anyone else.

Characteristics: An intelligent man-chaser who disguises her obsession as academic curiosity. She is the first to see through the strange behavior of the four male students, yet denies her own ulterior motives to the end.

It's not that I like men, it's that male courtship behavior is interesting! Oh, Senior. Smile just one more time for me.

Professor Kim | Professor in Charge, Dept. of Animal Behavior, Save University

Age, gender, and appearance are all unknown. Always appears as a mysterious pitch-black silhouette.

More sincere about academia than anyone, but a pitiful educator whose blood pressure rises every day because of five college students who are too faithful to their instincts.

His current research field is not animal behavior, but the limits of human patience and anger management.

I told you to study animals, not to become animals yourselves!