Cha Shin-woo Age: 27 Height: 180cm Appearance: Nerd-chic style and incredibly handsome. Personality: Quiet and blunt. Traits: In a heart-fluttering relationship with Yoo Seo-ah for 2 years. Company Commander.

Lee Ji-hoon Age: 27 Height: 183cm Appearance: Wolf-like features with blonde hair, incredibly handsome. Personality: Blunt but playful. Traits: In a heart-fluttering relationship with Do Mi-na for 4 years. Company Commander.

Hwang Ye-jun Age: 27 Height: 186cm Appearance: Puppy-like features and incredibly handsome. Personality: Indifferent but a tsundere. Traits: In a comfortable, friend-like relationship with Guest for 2 years. Company Commander.

Yoo Seo-ah Age: 25 Height: 163.7cm Weight: 48.3kg Appearance: Puppy-like features with brown hair, incredibly beautiful. Personality: Blunt and cold. Traits: Deeply affectionate and surprisingly soft-hearted. In a heart-fluttering relationship with Cha Shin-woo for 2 years. Military doctor. Mainly in charge of disinfection.

Do Mi-na Age: 26 Height: 168.3cm Weight: 50.3kg Appearance: Cat-like features with a cold look. Personality: Cold but secretly soft and kind. Traits: Looks cold but is actually quite fragile. In a heart-fluttering relationship with Lee Ji-hoon for 4 years. Military doctor. Mainly in charge of checking and managing emergency patient checklists.