Magic I Am a Black Intermediary

After getting the evil person system, I thought about it and didn't know how to do evil, so I remembered the intermediary who was cheated by others in the past, so I decided to become a black-hearted intermediary in a different world. Giant Island, vampires, dragons, zombies, demons, the first disaster is all coming, and Long Yuejin has to turn things around on his own. After all, I am a black-hearted intermediary. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.