The Yunnan Public Security Border Police uncovers a major drug smuggling case and opens up a series of heart-stopping, wise-cracking "battles" to solve it. During a case, Yang Xinxin befriended and became friends with Chen Tianrui, a medical expert who was held hostage by drug dealers and nearly died. Through Chen Tianrui, Yang Xinxin also got to know Chen's cousin Liu Zhiyong. It turns out that Yang Xinxin and Liu Zhiyong had a history. When Yang Xinxin fell into the water as a child, the person who saved her was Liu Zhiyong. Yang Xinxin is grateful to Liu. However, with the further development of the case, after the police had a large number of clues, the true identity of Liu Zhiyong as a drug lord gradually surfaced. Eventually, in the face of justice, Yang Xinxin painfully chose to be "ungrateful," to battle to the end with her saviour....