Can't Survive Thirty? I Give Credit to God

People in Shengdao Village will not live past thirty. When Ah Cheng was sixteen years old, he made a calculation for himself: he had fourteen years left, and his sister had twenty-three years left. The way out is not to walk into the mountains by yourself, someone has to pay for it with his life. He went into the mountains to look for medicine and accidentally entered an ancient Gu cave three hundred years ago. When he was about to die, a longevity Gu that had been sleeping for thousands of years recognized him as its master - it fed on longevity and was born by devouring calamities. From then on, every time he became stronger, his death date came closer. This is a world where everyone is mortal: the nine realms are at their peak, and immortals are also old; longevity medicine has a price, and stealing life is a sin. Immortals from past dynasties have spent their whole lives, but they have not been able to solve the problem of "endless life". Ah Sheng doesn't know anything about the avenue. All he knows is that life is given on credit, so he has to make a name for himself on credit—— He wanted to get back the money he gave to Tian on credit, including the principal and interest.