Someone

(spoiler) So nano machine is about being a sect leader that called cheonma right? Cheonma is like a title for the demon sect leader only. In nano machine, the mc become the cheonma and inherit the skill and knowledge about cheonma that passed down from the first cheonma. With the help of nano machine of course. The connection is, this story is about the first cheonma. The one who will establish the demon sect. In nano machine, first cheonma famous as the strongest being on demon sect even people from orthodox recognize it. So this story about how the first cheonma life before building his own sect. He also can make his own skill by learning and combining all knowledge he knows. I dont read the novel yet, but people said that in nano machine dont have skill like this and that, they said mc likes to steal or learn other skill then he killed them(hes maniac as you know). And this story is years ago before the nano machine timeline, so there must be some difference in sects, social life, how the world work, and many more. Thats the only thing i know, maybe there will be people that read the novel will tell you the detail ٩(๑❛ᴗ❛๑)۶

These two have novel? That's news to me lol. Another question, does this mean the mc in MMM is the first leader then is he the one appearing when there is flashback in Nano Machine? Particularly when the mc in NM is learning abt the stone carving on each floor

I bet he is. I dont read mmm yet, but the nm describe indeed he is.