I Level Up the Weakest Solo Leveler

Khan was a demon king, who had ruled hell for centuries. he was no ordinary demon king but a human who ruled hell. demon's under his command, he stayed loyal to his power and people for a very long time but, his companions were not so satisfied with a human being a demon king. they betrayed him and sealed away his powers and he was left alone in the emptiness of hell. where no one was present except him. for centuries, he was trapped there but one day, a system notification appeared. [we have heard about your desire for revenge] [if you want to take your revenge, accept the offer to work for the system] the desire for revenge was all over his mind. without any second thoughts. [yes] [contract made successfully] [you will be sent to a place, where you can regain all of your strength if you follow the orders] he was sent to the modern world, a place that was new to him. he only had one mission there. [find the weakest hunter and make him the strongest] [once fulfilled, you will regain your sealed powers] smiled... "just you all wait, I will take my revenge on you b**tard" Since chapters will be released every Monday and Tuesday. Until then, you can read the other novels I am writing. SSS-rank hero retiring to start his villain arc. discord: https://discord.gg/FWVX6T4B