The film tells the story of the Northeast Street Fighter A Neng who lives in Hong Kong. He was interrogated by the police as soon as he sneaked ashore. Fortunately, Jia Hui, who returned from studying abroad, rescued him. However, Jia Hui's father died of a serious illness, and the southern part of the walled city he was in charge of was watched by all forces. A Neng takes care of Jia Hui in time, and gets acquainted with Sister Hong in the western district under the lead of A Kun, who wants to reorganise the order of the city. At this time, the mysterious evil forces that have been entrenched in the North District for many years stretched out their claws

A love story that happened in the youth campus, when friendship, love conflict, how to choose? What is the taste of first love, like a summer flower to tell you slowly.

The criminal police headed by He Bu from the Jingcheng City Public Security Bureau have been investigating the drug trafficking case of the Yue Cheng gang. Due to insufficient evidence, they have been unable to start. One day, He Bu happened to encounter Yue Cheng suspected of murder and brought him back to the police station. The murderer killed Luo Xiaolan because he wanted to get back a priceless diamond necklace that was engraved with the password of all the criminal evidence and financial status of the Yuecheng Group. After Luo Xiaolan died, only Luo Xiaomei knew where the necklace was hidden. The police hope to prosecute Yue Cheng for intentional homicide, and search for evidence of his drug trafficking and other cases, so as to wipe out his drug trafficking organization. For her own greed, Luo Xiaomei did not cooperate with the police at first, which brought the case investigation to a deadlock.