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The main character, Siwoo Lee, lost his parents to a murderer 10 years ago. Finally, he meets Jack, the killer who killed his parents, and beheads him . “It wasn’t me who killed your parents.” After learning that the real culprit is a ‘contractor’ belonging to a group of killers using superpowers, Si-woo Lee decides to hunt down the registrants with Jack’s help.
[source]https://www.mgeko.cc/manga/killing-killer/[/source]
