Ling Qingci, the eldest princess of Dayi, is a coquettish and powerful woman who wields military power. Ten years ago, she chose Dan Yan, the protégé of Xidan, as her attendant at a glance. Dan Yan's frail appearance hides a tenacious strategy. He has a family feud, but he is willing to be her "prison pet" and fulfill his promise to protect her throughout his life. The two ran in both directions amidst the palace intrigues, civil strife in Xidan, and Japanese pirate invasions. From the entanglement between master and servant to the dependence of life and death, they not only worked together to eliminate enemies and stabilize the country, but also faced their deep love in the shadow of swords and swords, and finally became each other's only destination.