The story unfolds with the theme of "If you can test whether the fetus is a mental patient through fetal gene testing, and the baby in your belly is confirmed to be a patient, would you choose to give birth to it?" It will be different from previous TV dramas on mental illness. Lee Seung-gi plays an upright young detective who fights for justice when faced with injustice and will confront a criminal with congenital mental illness who has terrorized the whole country, a role that completely changes his life.