21-year-old hypnotist Huang Li enters the Zong family to apply for a job and gets successfully hired in order to earn money for her younger sister's medical treatment. But she quickly discovers that the price of this high salary is far more than simply hypnotizing people to sleep. The fourth young master of the Zong family, who has suffered from insomnia for nineteen years, is cold and suspicious, rejecting her treatment; the sixth young lady, whose fiancé cheated on her, loses herself in the vortex of love and hatred, targeting her crazily; the seventh young master, driven to a breakdown by his controlling mother, treats self-harm as an everyday routine, yelling at and hurting her; and the crown prince of Shanghai, with an extremely strong desire for control, pushes her step by step. With her voice as medicine and sincerity as a blade, Huang Li heals everyone suffering from insomnia night after night, step by step.