Jung Eunji is a prodigy and a new clinical psychologist who has been assigned to a mental hospital. She isn't expecting much since she only joined the medical world to make her family happy. Her father is a renowned Endocrinologist, her mother is Pediatrician, her older brother is an Orthodontist, her older sister is a Cardiologist, her twin brother is an Immunologist and her younger sister is studying to be a Neurologist. So it's no surprise that Eunji had to join the medical world like the rest of her family. Eunji only thinks of this as a job. That is until she gets assigned her first patient, the breathtaking and troubled Son Naeun.

Son Naeun is a quiet and unstable patient who resides in the mental hospital that Eunji has been assigned to. Naeun's only living family members are her older brother and older sister, but she rarely sees them because she is forced to stay in the hospital. When she's not under any stress, she is quiet and shy, but when she feels threatened, she becomes violent. Every doctor who had been assigned to her previously have given up on her, so she doesn't care when she gets a new doctor. She just thinks she'll leave like everyone else. However, the doctor this time seems different. The optimistic and eye-smiling doctor is patient with her no matter how cold and violent she treats the cute psychologist, Jung Eunji.