I, Doomsday, Start by Punching Darkseid.

When Lu Yuan opened his eyes, he found that not only had he traveled through time, but he had even become the infamous Doomsday. Then he got memories related to himself and discovered that he was once the supreme marshal of Krypton, commanding the entire Kryptonian army. But he died accidentally during an operation, and was secretly experimented on by Kryptonian scientists. He was also made to resurrect on the Doomsday. The resurrected Doomsday is no longer the light of Krypton, but has even become Lu Yuan. Where should he go? How should we face our childhood sweetheart in this body? Even Lu Yuan has to face the threat from the new god Darkseid. "Darkseid? I heard that you are very strong? Have you asked me for my opinion?" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.