Who is he

In 1988, the criminal guard Guoping (Zhang Yi) ) witnessed the sacrifice of his comrades while pursuing a series of mysterious cases, but the murderer escaped. This incident became a knot in Wei Guoping's heart. Eight years later, a horrific murder occurred in Ningjiang City. At this time, Wei Guoping had grown into a mature criminal police captain. While leading his team members to investigate, he successively uncovered many related cases, but the murders were always full of doubts, and many clues were related to the serial mysteries eight years ago. These discoveries excited Wei Guoping but also became an obstacle for him to later judge the case. As the case progresses, a huge criminal group gradually emerges...