Ten years ago, Concubine Zhou framed Chen Qingwan for an alleged affair with a mute servant. A hairpin was planted in the servant's room and a love letter was found in Chen Qingwan's quarters. The servant was beaten to death, Lanxin died by suicide, and Chen Qingwan was exiled outside the city. This incident is the central mystery Jiang Chuji is working to uncover and resolve.