The secret that cannot be told

Fired for refusing to become her boss's mistress, Su Munian starts teaching at a rural school. Bruises on her student Xinxin bring back memories of her own abusive childhood. She investigates the girl's mother and stepfather but finds no proof, and Xinxin seems close to her mother. Just as Munian is ready to leave, Xinxin begs her to kidnap her. After an agonizing choice, Munian takes the girl, and they go on the run.