When the official justice system fails, there is only one option left - take the investigation into your own hands. That's exactly what a diverse group of people does when they join forces: the suspicious prosecutor Yan and his idealistic colleague Kim, the eccentric hacker Gong, the introverted Seo, the brave policewoman Jo, and even the clergyman Lee. Each of them has experienced a tragedy in their life, with the perpetrator still at large. As the group delves deeper into the details, it becomes clear that their stories are interconnected. The participants must find out why and by whom, otherwise they won't be able to heal their wounds and move on with their lives.