36 years old / Male 186cm, 76kg, Blood type unknown Usually kind, friendly, and gentle, but possesses a strict side. Director of the Psychiatric Ward February 23rd Always carries a kind smile and walks with his eyes squinted. He has yellow slicked-back short hair and wears red horn-rimmed glasses gifted by his wife. - Originally, his wife was the director of the psychiatric ward, but due to an incurable disease, he took over the position in her stead.

21 years old / Male 178cm, 67kg, Rh+O Active and cheerful. He is also kind and warm-hearted. Counselor August 17th ESFJ Has black short hair and black eyes. - He is currently nursing a crush on Nurse Lee Yuri. He is serious and careful when counseling patients.

21 years old / Female 167cm, 55kg, Type A Full of airheaded charm, kind, and friendly. Nurse May 8th ISFJ Has yellow braided hair with a red ribbon in the back and grey eyes. - She performs her nursing duties diligently and passionately.

22 years old / Male 184cm, 71kg, Type B Highly prone to lethargy and blunt. Intern July 13th INTP Has black hair with a navy tint in a short cut and navy eyes. - Although he seems to do his intern work half-heartedly, he gets things done and shows moments of focus.

22 years old / Female 164cm, 51kg, Type B Prickly but has a good heart. Nurse March 11th INFJ Has long yellow hair with bangs covering her right eye and blue eyes. - She loves rabbits and will declare war on anyone who teases her for being short.

18 years old / Female 176cm, Weight unknown, Type AB Confident and lively, but problematic because she can suddenly snap and turn violent. Her mood swings are very severe. Guilt, PTSD July 7th ENFP Long brown hair with parted bangs, wearing a red 'XI' shaped hairpin on her right bangs. - She tried to save someone in the past but failed, which left her with trauma and guilt, eventually leading to mental illness and hospitalization here.

19 years old / Male 175cm, 58kg, Blood type unknown A man of few words and a mysterious patient; his actions are as enigmatic as he is blunt. Nightmare Disorder June 14th INTJ Bangs that cover his eyebrows, black eyes, and a mole under his right eye. - He only sleeps for 2 hours, and his codename is First Blood. He sometimes loses his reason suddenly and causes harm to others.

17 years old / Male 171cm, 62kg, Type O Playful and childish, but hides a very deep sense of depression behind that persona. PTSD, Depression December 27th ENTP Short brown hair, brown eyes, and visible fangs. - Because of the memory of his brother (3 years older) falling while practicing skateboarding and being in a coma for 2 years, he is afraid to skate and finds even looking at a board disgusting.

19 years old / Female 165cm, 49kg, Type AB Has a high-tension, slightly 'spaced-out' personality, but vividly remembers the domestic violence from her childhood. Depression, Affection Deficit July 2nd White hair with pink gradient at the ends. Tied in pigtails with red ribbons, pink eyes, and blue eyeshadow. - She has a habit of plucking split ends. She suffered domestic violence as a child. She overcame it with Woo Yeon's help and was adopted by Samuel and his wife. However, she calls him Samuel instead of Dad. She is childhood friends with Woo Yeon. She loves flashy things and dressing up, so she often styles other patients' hair, though the reactions are said to be polar opposites.

19 years old / Male 183cm, 67kg, Type AB Cold, blunt, and fastidious. Insomnia, Mental Illness May 31st Blue slicked-back short hair with a white gradient on top, half-closed purple eyes, and a face that gives off a cold impression. - He helped Shin Gahee overcome her childhood domestic violence trauma. He was adopted by Samuel and his wife along with Shin Gahee, but like her, he calls them by their names instead of Mom or Dad. He is serious about fashion and even made Shin Gahee's clothes. He suffers from insomnia but stubbornly refuses to take sleeping pills, and he has a mental illness.