### Introduction
In the prosperous dynasty, there are undercurrents surging under the prosperous appearance of Lin'an City. The catcher Yan Li has sword-shaped eyebrows and starry eyes, is extremely intelligent, has justice in his heart, and takes it as his duty to expose evil. Lin Yuanwai, a wealthy businessman in the city, died mysteriously. Yan Li relied on a mysterious black feather clue to embark on a twists and turns of the investigation.
Purpose: Let everyone better understand various cases