Zhen Huan turned black in episode 30.
Concubine Hua took advantage of the emperor's absence to bully Zhen Huan into kneeling for a long time, causing her to have a miscarriage.After the emperor came back, he deposed Concubine Hua and asked her to reflect for two hours every day.Zhen Huan endured the pain of losing her son and wanted the emperor to kill Concubine Hua, but the emperor was forced by the power of the Nian Gengyao clan and did not dare to attack Concubine Hua, so he could only comfort Zhen Huan.Zhen Huan lost her child and was extremely disappointed in the emperor.