A "secret letter conspiracy" led her to embark on the road to seek the truth. When she first entered the palace, she unexpectedly fell into a premeditated fog, and as she got closer to the truth step by step, she uncovered the unknown mystery of her life experience. A young king, behind his indifference, he only offered tenderness to her. He once promised to take her out of the palace to live a life of seclusion in the mountains, away from the disputes in the court, but who is in charge of the ups and downs in this world?