On the night Shen Yunjin got married into the Governor's Mansion, her second concubine gave her a bowl of sweet soup with added ingredients. She drank with a smile, then turned around and placed the soup bowl in the peony flower pot that was her second aunt's favorite. No one knows that she is the sharpest knife in Beiyang, codenamed Nightingale. When the military governor Gu Shaoting lifted off the red hijab, she timidly called out "Master". The man looked at her with squinted eyes, his eyes like a knife scraping across the bones. Shen Yunjin's heart skipped a beat, this man was not easy to fool. Sure enough, that night she discovered a top-secret telegram hidden in Gu Shaoting's study, with four words clearly written on it: Capture Nightingale. She smiled down and put the telegram back where it belonged. The water in the Governor's Mansion was deeper than she thought.