World-Saving is a Skill

For 20 years, Hyeonseok battled monsters in another world, ultimately succeeding in saving it and being rewarded with a return to Earth. Reborn into his old life as a former deliveryman named Chanseok, he initially looks forward to enjoying modern comforts. However, he quickly realizes that Earth has changed drastically during his absence. Monsters now emerge from unpredictable Erosion Points, and individuals with special abilities are designated as Hunters to eliminate them.