After a fatal car accident, 28-year-old business prodigy Su Jin is reborn in her 18-year-old high school days. But when she exposes events from the future, she is declared mentally ill and sent to Yunshan Psychiatric Hospital, where she faces a crisis of identity.
At the hospital, Su Jin discovers that her fellow patients each have secrets of their own: a hacker boy posing as a patient, a mute genius painter, and an elderly woman with the ability to see the future. Together, they form an unlikely alliance.
Su Jin gradually uncovers that the psychiatric hospital is actually an experimental base for a mysterious organization. Its doctors are conducting inhumane research on people with special abilities, and her rebirth was no accident...
