A twist of fate took the life of legendary hitman, Wu Qi. Strangely, he was not even aware of the identity of his killer. It was then that the Killing Intent System revealed itself to him. Wu Qi and the system made a pact— as long as he completes the tasks he was assigned with, he would get a chance at resurrection and uncover the truth behind his death. Just like that, Wu Qi, with the help of the Killing Intent System, travelled through time and space to put an end to enemies who are intent on killing others. Despite shouldering the burden of unpardonable sins, he decides to commit himself to saving the universe.