Food delivery worker Jiang Feng transmigrates into a frail little snake, activates the Devouring Evolution System, and only wants to quietly cultivate and evolve into a heaven-swallowing giant python to live in peace. Who would have thought he accidentally forms a contract with the reborn empress Su Lingxuang, completely disrupting her calculated rebirth plan. Su Lingxuang is both angered and helpless, yet discovers this spirit snake has boundless evolutionary potential. The two venture together, with Su Lingxuang seeking heavenly treasures for him to aid his transformation. Jiang Feng progresses from a white snake to a Hanyue scale snake and a feathered snake god, ultimately becoming a heaven-swallowing giant python. Relying on each other, they quell internal human rebellions, resist heavenly and earthly catastrophes, jointly defeat extraterrestrial demons, and together ascend to the peak of the myriad realms.