Xie Shuangning helped Li Chengzhao detoxify and became the crown prince, but he favored his former maid Biyun and suffered humiliation and cold treatment. She was poisoned and had only one month left to live, but she didn't get any sympathy. It was not until she died with hatred that Li Chengzhao learned the truth and the truth about his life-saving grace when he was young, and he felt filled with regret. In the end, he gave up everything and followed Xie Shuangning, leaving endless regrets in his life.
