Convenience store owner and single father Lin Jianjun, because his five-year-old daughter was seriously injured by Zhou Liqin's unleashed fierce dog, instead faces arrogant humiliation and threats regarding problematic milk powder. He resolves not to compromise anymore, using legal weapons and a food safety cold storage to set a sky-high trap and completely secure the evidence chain. Zhou Liqin takes risks for her son's procurement project, bringing people to smash the storage and destroy evidence, and is finally arrested on the spot, escalating from letting a dog bite people to felony charges. Erhu goes to blackmail and instead exposes his identity as the dog owner, getting controlled by the police. The malicious neighbors go bankrupt, and justice though late arrives all the same.