The King of The Fallen Kingdom

You are a human who died after being bullied by your classmates, the gods who took pity on you gave you the opportunity to reincarnate as the son of a king. But when you entered the portal, The portal led you to the wrong place and made you reborn as a goblin. In that world, Goblins are hunted by humans to increase their hunter level and that makes you have to strengthen yourself, whether you like it or not. By defeating normal humans your level will increase but not as much as humans get when killing a Goblin, but when you kill a human with hunter level your level will increase drastically. Compared to the Goblins who can't think, you have the advantage of having the memories and thoughts of a human in your next life.