Synopsis：Five years ago, the heroine was drugged and spent one night with the hero. She was thrown into a mental hospital by her family and gave birth to a "stillborn baby". Five years later, the heroine's family took her back and asked her to marry the ugly and disabled hero in place of her sister. The heroine wanted to investigate the truth of the murder. She saw at a glance that the hero was poisoned and proposed to cooperate with him to save him. The hero also agreed that the heroine should stay here. The two of them started a cooperative marriage with their own purposes...