A financial officer from a well-known group company in Pengzhou "accidentally" fell to her death in an elevator shaft. Her last contact-clothing company owner Yan Pingan-felt extreme fear after hearing the news. As a former detective, Yan Pingan, using his intuition and experience, suspected that the accident was a signal from the group's CEO, He Dongping, aiming to silence both of them. Facing the dire situation like a cornered beast, Yan Pingan barely escaped to Beijing, seeking help from an old acquaintance, Ou Yangxu, who was then the head of the National Taxation Bureau's Enforcement Department, hoping to gain protection and report the city's corporate tax evasion practices. Through a series of intense investigations and operations, Ou Yangxu quietly assembled a task force that cooperated with judicial authorities, successfully uncovering major cases such as fraudulent invoicing and smuggling tax evasion, eliminating criminal organizations and restoring fairness and justice for both the people and businesses.