Revenge KIlling Game!

A group of killers had believed they successfully killed a pair of young boys... When in truth, they were alive and seeking fo revenge. And though that large group of killers had no choice but to do so... They were still at fault. Unfortunately, They did not know each other at all. They didn't see the face of anyone in that group no words exchanged and they 'killed' the two boys then left. They did not know that it would come to bite them back in the future... As revenge, they're forced to participate in a killing game where they have to kill each other and learn how they were related to each other in the past... In the progress, some very dark secrets will be revealed.. Can they get out with their sanity intact? Will they even get out?