During the Qingyuan period of Daning, Lin Zhaozhao, a coolie from a poor family, was wrongly imprisoned because his sister was involved in the massacre of his family. In a desperate situation, the "Case Solving Prompt System" is activated, and the key clues given by the system are used to solve the case and reveal that the murderer is the clan leader who occupied the Lin family's ancestral home. From then on, Lin Zhao worked as a "litigation lawyer", helping low-level people to reverse their cases while tracing the secret family history of his father's death when he was framed. In the process, he cooperated with Su Wanting, a female accountant at a drug store in the county town, and successively uncovered adultery and murder cases among wealthy families, corruption cases in the capital city, and serial conspiracy cases in the provincial capital. Finally, it was revealed that the prime minister was the man behind the frame-up of his grandfather (former criminal prosecutor of the Ministry of Justice). Lin Zhao relied on his system and wisdom to defeat the powerful and save his family. He grew from a coolie to "the best lawyer in the world" while protecting the happiness of his sister and his lover.
