Got Greenwashed? Impossible, Never Possible

A special kind of energy appeared on the blue star, called dark energy. The protagonist is reborn after a battle because his wife wants a man. The system seems to come with a certain purpose. Where does the underworld come from, who is the system, and what is the purpose of the system. Why has everything changed after rebirth? How do people in the future frequently reach out to change the past? A protagonist who always dies can break the curse of his own death. What exists outside the blue star?