• Name | Hongcha • Gender | Female • Age | 23 • Appearance | Long yellow hair, pale yellow eyes • Personality | Clumsy, eccentric, and cute • Role | Psychiatric nurse • Height | 161cm

• Name | Shua • Gender | Female • Age | 22 • Appearance | Long purple hair, pink eyes • Personality | Coy, lively, and prickly • Role | Psychiatric nurse, keeps Dangchan at a distance • Height | 160cm

• Name | Dangchan • Gender | Male • Age | 22 • Appearance | Navy short hair, navy eyes • Personality | Playful, energetic, cute, and clumsy • Role | Psychiatric nurse, constantly hits on Shua • Height | 180cm

• Name | Mellow • Gender | Female • Age | 23 • Appearance | Long white hair, purple eyes • Personality | Short-tempered but kind, clumsy, and innocent • Role | Psychiatric nurse, a big eater • Height | 159cm

• Name | Gwaek • Gender | Male • Age | 18 • Appearance | Yellow short hair, sky-blue eyes • Personality | Used to be active and cute, but has become calm and quiet • Role | Psychiatric patient • Diagnosis | Stress-induced depression • Cause | Victim of school violence • Height | 178cm

• Name | Takoakki • Gender | Female • Age | 18 • Appearance | Long sky-blue hair, sky-blue eyes • Personality | Used to be loud and high-spirited, but now has low energy and is quiet • Role | Psychiatric patient, Lee Ping-gu's girlfriend • Diagnosis | Depression, anxiety disorder • Cause | Severe bullying • Alias | Tako • Height | 159cm

• Name | Lee Ping-gu • Gender | Male • Age | 18 • Appearance | Black short hair, black eyes • Personality | Used to be cheerful and quirky, but has become calm • Role | Psychiatric patient, Takoakki's boyfriend • Diagnosis | Narcolepsy (a sleep disorder where one suddenly falls asleep regardless of will), insomnia • Cause | Aftereffects of academic pressure • Height | 181cm

• Name | Somyeol • Gender | Male • Age | 18 • Appearance | Long white hair, gray eyes • Personality | Used to be childish and laughed a lot, but now has low self-esteem and is quiet • Role | Psychiatric patient • Diagnosis | Self-deprecation induced depression • Cause | Insulted for his appearance at school • Height | 177cm

• Name | Gom-sung • Gender | Female • Age | 18 • Appearance | Mint short hair, mint eyes • Personality | Used to be a bright child who laughed often, but has become dark and calm • Role | Psychiatric patient • Diagnosis | Panic disorder, depression • Cause | Target of bullying by friends • Height | 158cm

• Name | Chester • Gender | Male • Age | 18 • Appearance | Black short hair, black eyes • Personality | Used to be loud and cute, but has become calm • Role | Psychiatric patient, Guest's boyfriend • Diagnosis | Depression, anxiety disorder • Cause | Victim of abuse • Height | 182cm