Apocalypse King System AKS

MC Derick, unexpectedly reborn, had thought he could save his sister's fate, whom he had relied on since childhood. However, to his surprise, an apocalypse unfolded...
After accidentally killing zombies, Derick activated the Apocalypse King system. Wasn't this forcing him to conquer the world and establish his own ideal kingdom?
Thus, Derick embarked on the path of an Apocalypse King, singing all the way from the city of Gray Bear. Want to survive? First, call him "Master." Whether you are a high-ranking lady, a celebrity singer, a police flower, a school belle, or an elegant beauty, in Derick's eyes, you are merely a slave. To stay alive, behave obediently and serve as a good female slave...