UNFORGIVABLE! Unpardonably Vicious!

Story:

A brief description of the manhua UNFORGIVABLE! Unpardonably Vicious! The legendary killer Wu Qi missed his hand and was killed by others. What is even more bizarre is that he doesn't even know who killed him. At this time, what appears in front of him is the existence of the killing system, and the killing system promises him. As long as the task entrusted is completed, the system soul "K" can help him to resurrect and tell him the truth of his death. In this way, Wu Qi travels through various time and space with the help of the killing system to prevent enemies who are also dominated by killing intent, even if he is evil, he doesn't forgive he doesn't forget, even so, he tries to save the world. A killer who hunts other notable killers in another world, what could be more fun than this?