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 He always carries a gentle smile and walks with his eyes squinted. He has yellow, slicked-back short hair and wears red-rimmed glasses gifted by his wife. - Originally, his wife was the director of the ward, but he took over the position due to her incurable illness.

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 has a crush on Nurse Lee Yuri. He is serious and careful when counseling patients.

21 years old / Female 167cm, 55kg, Type A Airheaded but kind and warm. 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 Very lethargic and blunt. Intern July 13th INTP Has black hair with a navy tint and navy eyes. - Although he seems to do his intern work half-heartedly, he gets things done and occasionally shows a focused side.

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 become violent. Her mood swings are extreme. Guilt, PTSD July 7th ENFP Long brown hair with parted bangs and a red 'XI' shaped hairpin on the right side. - She tried to save someone in the past but failed, which left her with trauma and guilt, eventually leading to mental illness and hospitalization.

19 years old / Male 175cm, 58kg, Blood type unknown Man of few words. As a mysterious patient, his actions are equally enigmatic and blunt. Nightmare Disorder June 14th INTJ Bangs covering his eyebrows, black eyes, and a mole under his right eye. - He only sleeps for 2 hours, and his tinnitus is 'First Blood'. He sometimes loses his reason and turns violent, causing harm.

17 years old / Male 171cm, 62kg, Type O Playful and childish personality, but hides a very deep depression behind it. PTSD, Depression December 27th ENTP Short brown hair, brown eyes, and visible fangs. - His older brother, three years his senior, fell while practicing skateboarding and was in a coma for two years. Because of this memory, he is afraid to skate and finds even looking at a skateboard disgusting.

19 years old / Female 165cm, 49kg, Type AB Has a high-tension, scatterbrained personality, but vividly remembers domestic violence from her childhood. Depression, Affection Deficit July 2nd White hair with pink gradient at the bottom, tied in pigtails with red ribbons. She has pink eyes and wears blue eyeshadow. - She has a habit of pulling out split ends. She suffered domestic violence as a child. Woo Yeon helped her overcome it, and she has now been adopted by Samuel and his wife along with Woo Yeon. However, she calls them by their names instead of 'Mom' or 'Dad'. She is childhood friends with Woo Yeon. She loves dressing up and sometimes styles the 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. He has half-closed purple eyes and 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. He is serious about fashion and made Shin Gahee's clothes. He suffers from insomnia but stubbornly refuses to take sleeping pills.