Lin Yue, a modern young man, accidentally travels into the Great Wilderness of the Classic of Mountains and Seas and is reborn as a weak weasel. While being hunted by the Black Wind Wolf Demon, he activates the Infinite Devouring Evolution System, which allows him to devour all things and analyze his opponents' weaknesses. He battles countless demons, seizes bloodline divine abilities, and fights demon kings in secret realms. By fusing the origins of Qiongqi, Taotie, and Yinglong, his power increases dramatically. When the demon lords of the Great Wilderness surround him, Lin Yue breaks through their formations, defeats his enemies, and kills a demon lord after a fierce battle, ascending to the position of the Great Wilderness's false master of the Mountains and Seas. Unexpectedly, the sky splits open, revealing an extraterrestrial rift. The Great Wilderness turns out to be merely a fragment of the true Mountains and Seas realm, and ferocious beasts from beyond are approaching. His journey across the Mountains and Seas has only just begun.