Su Jin, a top female spy codenamed "Qingque", was on death row for betrayal by the organization. In order to survive, she was forced to make a deal with someone and marry the powerful, cold-blooded and cruel regent Xie Weilou instead of the daughter of the Prime Minister who looked very similar to her. On the night of their wedding, Xie Weilou saw through her disguise, but kept his cool. He only regarded her as an interesting chess piece to observe how she would survive in this treacherous capital city. Su Jin relied on the disguise, insight and psychological tactics he had developed over many years of being a secret agent, and he was able to navigate the "workplace" of the back house with ease, tearing up green tea with his hands, punishing evil slaves, and quickly establishing a foothold. While acting as the weak "White Moonlight" stand-in, she secretly developed her own power and used the resources of the Regent's Palace to investigate the truth about the organization's betrayal. In the process, she repeatedly used the professional skills of a secret agent to solve difficult outstanding cases in the court for Xie Weilou, showing amazing political skills and strategies. Xie Weilou's interest in her gradually changed from a "chess piece" to a "similar" appreciation and fear, and the relationship between the two jumped repeatedly on the edge of "cooperation, utilization, testing, and temptation". When the real daughter of the prime minister returned and tried to take back everything, Su Jin no longer needed a substitute. She used her real name and strength to gain a place in the court, and even established her own intelligence agency "Qingque Terrace". In the end, she teamed up with Xie Weilou to uncover the mastermind behind all the conspiracies and put an end to the turmoil in the court. Xie Weilou hired Jiang Shan to marry the real Su Jin, and she finally got rid of all the shackles and lived her own legend.
