Fantasy: I Became an External Envoy to the Underworld

After traveling through time, Mu Yu unexpectedly became an external escort to the underworld. The teacher in his previous life once gave him an evaluation: "Dare you ask the world to change its color!" In this life, he wanted to try this feeling. World? Sorry, there is no one who can fight! Underworld? Sorry, I was hired from outside! What does the battle between empires, races, and the three realms have to do with me? It is best if the well water does not interfere with the river water. If you have to cross the boundary... I'm afraid you don't know how to write the word "regret"! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.