Tales of demons and gods, Creation Origin Ancestral Manual

A young orphan boy, adopted into one of the three major families in Glory City the Divine Family by the family head to serve as his daughter’s personal attendant, dies during a demon beast horde attack. The disaster claims not only the lives of everyone, but also destroys the Glory City entirely… . . But fate is not done with him yet. . . Especially when he possesses a mysterious and powerful inheritance that allows him to return to his younger self, and grants him the chance to study and learn the knowledge, secrets and theories of the worlds around him left behind by various supreme experts of the past. . . Can he change not only his own fate, but also the fate of those around him, and prevent the tragedy that befalls Glory City and its people? . . Can he escape the clutches of mediocrity and become a supreme expert despite his poor innate talent? . . Can he save the only person he ever considered family in his previous life, help her escape the condition she is trapped in, and prevent her from becoming the withered princess of the Divine Family? . . And what exactly is the Creation Origin Ancestral Manual and why is something like this hidden within his body?