On the night of the massacre, Shen Zhaoning went crazy. She was thrown into the clothing bureau and kept talking nonsense, but every word turned out to be a prophecy. When Xie Yunzheng was ordered to investigate an old case, he discovered that the verses chanted by this crazy woman were actually his father's last words before his death. The secret letter sent by Liu Ruyan, the prescription mistakenly changed by Su Huaijin, and the nursery rhymes hummed by Aunt Zhao were all chess games she set. She is not crazy, she is waiting for someone who is willing to believe her and reveal the true crime of regicide that night.
