Alien Demon King and System

I traveled to another world and became the Demon King. Ah? Doesn't that mean you only have a few years to live? System, come to the rescue quickly. Do you think I will accept the wisdom halo and wait for the brave to come? Haha, I'm thinking too much. In order to live a happy life in the future, I can only attack the brave man in advance. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.