Mo Xing Xing suffers from mental illness because her mother died after saving a boy who lost his footing. Fortunately, accompanied by good friends Mi Sha and Lu Li, Mo Xing Xing spent a warm youth. However, one day Xing Xing discoveres that Lu Li was the boy who had lost his footing. Unable to accept the truth, she decideds to leave without saying goodbye. Ten years later, Mo Xing Xing reunites with her best friend, determined to face the past and open up the knot in her heart.