Fantasy City God Level King System

This is a world where humans fight against dark species! This is a world where martial arts is the most important thing! It has been more than twenty years since I came to this world, but I am unknown and doing nothing! Finally one day the King System is opened, you enter the King's Land, and you have the help of the King Hero! From an obscure fool working as a garbage truck to a world-destroying king. That's right, here is the fantasy city god-level king system! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.