Beirong was defeated and sent the princess to Dasheng for marriage. The princess died unexpectedly on the way. Tantai Yin, a craftsman who had been trained by the "Youge" since childhood and whose appearance was 70% similar to the princess, was forced to take over her identity, married into the capital, and became the concubine of the God of War Prince Jimo Wei. Her mission is to steal border defense maps and royal palace secrets.
Jimo Wei had a deep and violent personality, but he was highly jealous of the royal family despite his outstanding military achievements. He knew that there was something wrong with the princess, but he used his plan to lure her out of the "Secret Pavilion" behind the scenes and the enemies in the court. The two of them launched an extreme test and calculation in the small area of the palace. She poisoned her and he drank it with a smile; he set up a trap and she survived in danger. In countless nights of crises and ambiguities that are hard to distinguish between true and false, murderous intent and affection grow equally.
When the mystery of Tantai Yin's life experience is revealed layer by layer, when Jimo Wei's shocking plan comes to light, mission and sincerity, family, country and personal feelings collide fiercely. In the end, they must make a choice: should they continue to be chess players and chess pieces fighting to the death, or should they join forces to overturn the chess board and become each other's only accomplice and reliance?
