During the Yongxi era of the Dasheng Dynasty, the entire Lu family was executed for treason, but their youngest daughter escaped. Taking the name Lu Ci, she spent ten years mastering martial arts and another ten studying. Disguised as a man, she passed the imperial examinations at the top of her class and was appointed the princess's consort. On their wedding night, she and the eldest princess each had their own hidden agenda, and both recognized the murderous intent and scheming in the other's eyes. The princess wants to protect her younger brother, while Lu Ci wants to reopen an old case. They both seek to bring down the same man: Gu Song, the Minister of Personnel, who framed the Lu family and now controls the court. They agree on three terms: protect the crown prince together, serve as each other's allies, and part ways once their goal is achieved. But later, Lu Ci discovers that the princess's bottom line reads, "Sacrifice an ally if necessary," while she herself never intended to stake her life on anyone else.
Theme: Amid the ruthless struggle for power, hold fast to truth and justice.
