In order to prepare a surprise for his girlfriend Xiaoya who celebrated their third anniversary, the male protagonist purchased four 75 ml unopened bottles of SK-II fairy water in a duty-free shop. When he took the high-speed train through the security check at the high-speed rail station in City A, he encountered security inspector Li Na deliberately making things difficult. Li Na ignored the railway security regulations and asked the male protagonist to try the fairy water, otherwise he was not allowed to get on the train. They argued with each other, but were treated rudely by Li Na. The conflict between the two sides aroused the dissatisfaction of the onlookers, and also implicated Li Na in collaborating with the station director Zhang, manager Wang and others to embezzle the passengers' belongings. In the end, the male protagonist relied on legal knowledge, on-site evidence and the evidence of onlookers to send Li Na and others to the police station.
