Eighteen years ago, seven young people in housing estates, including Lin Langsheng (Tan Junyan), Shen Jingyi (Chen Shancong) and Xie Jiafu (he Yuandong), clashed with gangster Hu Qisi (Lin Haowen), and finally Qisi fell to the ground. The seven people were estranged from each other, and from then on they scattered things and did not return to each other. Eighteen years later, during the investigation of a traffic accident, the police found the bones of Qi Si, and the seventh son could no longer escape the great disaster he had committed in the past. At a time of contradiction and struggle, Lang Sheng has feelings with Ruan Lijin (Huang Zhiwen), the inspector of the major crime unit responsible for investigating skeletons, which is more confused inside. At the same time, Lijin's father, Ruan Jin (Lin Jiahua), also secretly tracked down the incident, which seems to have something to do with the bones. With the gradual emergence of the truth, the seven sons are in danger, who is the real killer?