The young accountant Wen Yuwan traveled through time and woke up to become the most inconspicuous little eunuch in the East Palace of the Tang Dynasty. In order to survive, she could only grit her teeth and hide her daughter's body, and survive every step of the crisis-ridden palace. Prince Shen saw that Yu was cold and suspicious, but he promoted her to his personal servant. While Wen Yuwan helped him deal with the undercurrents in the court and bring down political opponents, he was careful not to expose any flaws. But she gradually discovers that the prince also hides an unknown secret - he is not the real Shen Jianyu, but another time traveler. Two people who disguised their identities tested each other on the tip of a knife and redeemed each other.
