After the Fall of the Earth, I Became a Sairen

After aliens colonized the earth, they established a "human racing" system based on the horse racing entertainment competition that humans love. Want to eat food that can grow meat normally? Want to head to the prairie to gain residency? Want to survive? Then start running. Zhilan has lived in an incineration ground since he was a child. After an accident, he was so frustrated that he had to participate in the "Sports Race", where he met his childhood sweetheart, Wawu. After various encounters, he found that he had to kill her. (PS: The main plot, micro-suspense, and love appear more in the back)