I need help finding a story please

To put it as simple as i can in the start of the story animals have evolves and become destuctive nearly wiping out humanity leaving only one city a powerfull cultivator fighting them, outside the city for some reason blowes himself up killing the last city a student gets sent t the past before the evolution wakes up in a hospital when he gets out with the help of some woman he begins killing everyones pets at nightearning the nickname psycho pet killer or something like that later the beast begin to get big and mean at some point he forces one of the beast to sign a contract with him making him a beast trainer or beast tamer i cant remember what they called it
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