MC WILL go out as a child to find a secret cultivation manual. MC HAS a martial spirit that his grampa, in their tiny clan, misidentifies. And, absolutely, he WILL find people who'll offend him that won't live to regret it.
MC gets to go occasionally in the Diablo world, as if he were a player. There, he levels up (in various classes) and brings back his status to his real world. Occasionally, other things too.
So, if you wan't to know what this is about, think a little about... Hmm.. Maybe Gantz meets Hail The King meets any base building strategy game. So, a normal poor worker in Korea was given a chance to be part of something like a 'dream-world battle'. Every few nights he'd be summoned into a dream world very much like reality, but in there, he'd have territory management options. For instance, at the start, his territory was just his room. Which he could turn it into a base. Then, he could get other territories to build other things in order to build his army. Barracks, Research Towers, etc. But, he'd have to fight for the other territories in his dream and actually own (or have a rent contract) on them in REAL life. That's where it gets really interesting. He's given some habilities to help the real life part, while he levels up and acquires new skill in dream world. It's really good. But, you have to be warned, there is some plot-armor and he gets somewhat OP really fast (amongst his peers, as so far, there's always someone above), but he really has to fight hard for it.