朝鮮時代正祖16年間，名偵探金鎮(金明敏飾) 為了調查疑點重重的連環殺人案件的破案故事。接受了朝鮮國王正祖密令的金鎮在對官僚連環殺人案件展開調查時，遭受了神秘的刺客襲擊，在事件發展的關鍵時刻接受了狗肉販子瑞弼(吳達庶飾)的幫助而順利度過危機，並一舉查獲案情。在瑞弼的幫助下，金鎮開始著手尋找破案的頭緒-高山烏頭花，當中遇到了案情的關鍵人物韓客珠(韓智敏飾)，而她正是朝鮮最大商團的領頭人。隨著調查的展開，一個幾乎探索不到源頭的巨大陰謀也漸漸浮出了水面，等待著金鎮的真相則是足以顛覆整個朝鮮王朝的巨大醜聞…。

Synopsis:

It’s the 16th year of King Jeong-jo’s rule, a series of murders break out in the capital of Joseon. King suspects that the murders are a part of some high officials’ conspiracy to cover up an embezzlement scandal. He commissions a famous detective Kim Jin (Kim Myung-min) to solve the case and find out who is behind.

Kim Jin’s investigation is off to a shaky start as he gets attacked by assassins from day one. He narrowly escapes death with the help of a dog seller, Seo-pil (Oh Dal-soo). Together, they head out to Joseon to find Wolfs bane the flower that holds key to the case. In Joseon, they meet a beautiful business magnate, Han Kaek-ju (Han Ji-min) who seems to hold far more secrets than she first appears.