The Frozen Throne and the Negative Score Rookie

An ordinary young man who was accidentally frozen for five hundred years was unfrozen in the end of the world when civilization collapsed and the strong preyed on the weak, only to find that his combat effectiveness was judged by the system to be a shameful negative number. What's even more dramatic is that the weak childhood sweetheart he once needed to protect has become the overlord of the party. In order to survive, he had to relearn the rules of survival in this bloody world under the wings (and play) of the former "protected person", starting from the lowest "negative rookie", and gradually uncover the truth about the coming apocalypse.