"The Return of the Phoenix: The Biography of the Empress of Zhen Huan" tells the story of the resurgence of the harem and the former dynasty after Zhen Huan's son Hongli ascended the throne. Zhen Huan, who has become the Queen Mother, discovers that the new Mongolian Gege Ulanqiqige's life experience is suspicious. During the investigation, she uncovers a shocking secret that spans twenty years. At the same time, Zhen Huan's daughter Princess Longyue was involved in a power struggle and was forced to make a choice between family affection and love. When Zhen Huan discovers that the balance she has carefully maintained is about to collapse, she must strategize again to protect her children while uncovering the conspiracy behind Ulan and facing the cause and effect she laid in her past.