Min-hoo, who thought he loved his stepmother, hears the news of her divorce and wanders into a winter pond. And when he opens his eyes, Euphrates wakes up in an unknown world, and Emperor Sioen declares that Minhu will be the savior who will save Euphrates from 'recruits' and his rain, calling Minhu the 'moon man' of prophecy. In order to return to Earth in an unfamiliar world, Min-hoo struggles to resist fate...