Scumbag System: Host, Time to Do Your Tasks

He transmigrates into a playboy, a researcher, the male lead of a tragic romance, a general, and a workplace outcast. In every world, the original host dies with regrets. Then he arrives and rewrites everything: earning a title through military service, serving his country through research, saving the one he loves, overthrowing tyrants, and making a comeback at work. He has only one reason: these are the tasks he must complete.