He was once the last demon god who shocked the three realms. In order to avoid heaven's reckoning and endless disputes, he chose to seal himself and fall into a thousand-year slumber. When he opened his eyes again, he found himself in a completely unfamiliar steel city. His aura quietly revived, but the vast magic power he was so proud of had declined to the point where even food and clothing became a problem. What was even more troublesome was that a three-and-a-half-year-old cub who claimed to be his daughter, hugged his calf and complained that she was hungry, was looking at him with big wet eyes. In order to protect this bloodline that fell from the sky, the former devil had to learn from scratch how to make milk, change diapers, and tell bedtime stories. In the frantic daily life of raising a baby, he embarked on a hard-core transformation from a god of destruction to a protective daddy. However, the various forces that covet his origin as a demon, the urban monsters that have accelerated the mutation due to his awakening, and the child's mother with vague memories but unpredictable abilities are making this hard-won peaceful life run in an unpredictable direction...