I Became a Legend Across Many Worlds

After working himself to death on the job, he unexpectedly activates a System and is sent to various worlds to complete missions. He must clear them all if he wants to be reborn permanently in the otherworld he loves. Little did he know that he would become a legend across countless worlds.

Reborn, System, infinite worlds, apocalypse + otherworldly continents + science fiction + Western fantasy + Eastern fantasy