I Just Want to Cultivate a Brave Man Who Is a Demon King

Wang Shu is a patient suffering from more than ten mental illnesses. He has always believed that he can travel through time, and he actually did so! But unexpectedly, Wang Shu got stuck while traveling through time, causing him to arrive in the other world nearly a thousand years late. The original big devil was also killed by the indigenous people who worked together. Now the other world is peaceful and prosperous. However... Wang Shu: "How can a brave man without a demon king be called a brave man!? Since there is no demon king, then I will cultivate one myself! And then kill him!"