In a calm coastal town of Sanping City, the narcotics squad accidentally seize a batch of new methamphetamine that had a rare purity in an action, so Sanping Public Security immediately launches an investigation. The transferred police officer Zhao You Nan with keen sense of smell and insight, makes a target of Huang Zong Wei who did the chemical business from scratch. The cunning Huang Zong Wei ignites Zhao Younan’s fighting spirit. She keeps an eye on Huang Zong Wei. No matter where Huang Zong Wei hides, no matter how false her appearance is, she can dig up clues and find the truth without hesitation to arrest. The Public Security team led by Zhao You Nan versus the drug dealers led by Huang Zong Wei. Zhao You Nan goes after Huang Zong Wei, and Huang Zong Wei is good at hiding, which stages a “game of cat and mouse”