Eternal Undead

I turned out to be an unkillable monster! When I was crossing the road when I was 19, I was hit by a loaded truck and sent flying. I was stunned at the time, thinking that this was over and I would definitely turn into a puddle of meat. When I woke up, I was thrown into a secret laboratory hidden underground. From then on, the eternal human race was born, and the old human race withdrew from the stage of history.