Doomsday Search, Defeat and Withdrawal: Rebirth at the Beginning and Reaching the Top

No system + no Virgin + harem + power building, Xiao Yunyi, an old man who has survived in the apocalypse for ten years, died in a mission, and woke up to find that he was reborn before the apocalypse. In the previous life, there were regrets, disappointments, betrayals, and escapes. In this life, I want to become the top king of the apocalypse!