In the quiet coastal town of Sanping, the anti-drug brigade accidentally seized a batch of new methamphetamine in an operation. The scale and purity of the drugs were extremely rare, and the Sanping Public Security Bureau immediately launched an investigation. Zhao Younan (played by Yao Anna), a retired female police officer, targeted Huang Zongwei (played by Zhang Songwen), who was engaged in chemical business, with her keen sense of smell and insight. The scheming Huang Zongwei ignited the fighting spirit of the fledgling Zhao Younan. She stared at Huang Zongwei. No matter where he hid, no matter how advanced the false appearance was, she could dig up clues, discover the truth, and rush to arrest him without hesitation. The anti-drug police represented by Zhao Younan persevered in pursuing the drug trafficking group headed by Huang Zongwei, and finally successfully wiped out the drug manufacturing gang.