This book tells the story of Gu Qingci, a crime-solving knight who is carefree and full of sense of justice, and is accidentally involved in a mystery of family injustice. He formed a unique detective team with the mysterious Mo Sanniang, the optimistic pharmacist Hua Xiaochun, and the ruthless detective Feng Wujiu. In their constant humorous bickering and cooperation, they uncovered a series of confusing and murderous cases, and behind the conspiracy was a shocking conspiracy that could shake the government, the opposition, and the world. Good and evil, love and friendship, are intricate and complex, and finally reach the climax in a choice between justice and hatred. The whole book combines high-powered reasoning with a relaxed and humorous atmosphere. The characters grow distinctly and are reversed layer by layer. The cases are both relatively independent and interlocking, and finally converge to the conclusion where the truth is revealed.