Marvel: The Ultimate Superman - Chapter 89. Spinal Transplant, Ant-Man?

When the goddamn story leaves you no choice but to walk the path of the villain,The heroes aren't enough to save the world, as the calamity ultimately kills everyone and everything.Then, only by becoming the demon king can you survive, and only the demon king can save the world, but how?Of course, by conquering every other race, obviously.Can Axel become the demon king and survive, maybe save the world in the process?

Su Bai wakes up and finds that the world has changed drastically. He realizes he has come to a world of pets. After accepting the new setting, he is determined to become a powerful Pet Tamer.

Sa Bina was on her way to write her SAT when she suddenly finds herself in a strange world. She is sent to be the old emperor’s concubine, but on their wedding night, the emperor gets murdered by no one other than his own son and the heir! To survive, Bina makes a deal with beautiful but deadly Lucretius and her life in this dangerous kingdom begins.

Capital is power. The more you invest, the greater the power.

- Description from novelbuddy