The Shen family is framed, and the whole household is wrongly accused. To clear her family's name, Shen Qingci, daughter of a loyal official, enters the treacherous imperial palace alone. With her intelligence and resolve, she navigates one crisis after another, and unexpectedly meets the reserved and steadfast Crown Prince Xiao Chengyu. They begin by testing each other, but gradually learn to trust one another. Together, they expose the Lin siblings and their faction, who framed the Shen family, and restore the family's good name. But married life in the Eastern Palace is no easy road. The Empress, Liu, schemes in secret, the Prince of Shu covets the throne, and factions at court clash in a steady stream of trouble. When Xiao Chengyu travels to the northwest to investigate military funds, Shen Qingci is left alone to guard the Eastern Palace. She must deal with the intrigues of the inner palace while keeping a close eye on the undercurrents in the capital. Pledging themselves beneath the moon over Chang'an Palace, they stand side by side against the treachery of court and inner palace, vowing to protect each other and preserve the peace and integrity of the Great Jing realm.