@Myriad Eclipse
So, MC time travels into the future, but not the future where the guy who gave him Nano Machines is, he time travels 200 years before that time (or something close to that). Nano Machines are already invented, but they are at most generation 3 or 4, while the MCs Nano Machines are generation 7. In addition, the martial arts also declined and MC as the OG OP Demon G** is basically unrivaled as the one who whield original intact martial arts and his nano machines can control all technology around (and I think that also includes some other nano machines inside other people).
MC finds out that his descendants, while still hold power, gradually declining and also went astray and even plotted against him. Turns out that the guy who time traveled to the past couldn't leave, so he secluded himself in some cave for hundreds of years and was working on some stuff. But he couldn't do that alone, so he found himself a helper and also built a computer with an AI to help him do his research. But that helper betrayed him and the AI decided he wanted to be properly alive and went all evil, partially taking over the world in the future. So MC goes on a mass-murder spree and basically ennihilates all enemies in the future, helps his descendents recover lost martial arts and training methods and sets his family on the path of world domination.
(comment is too long, continue in the next comment)
Spoiler!
So, MC time travels into the future, but not the future where the guy who gave him Nano Machines is, he time travels 200 years before that time (or something close to that). Nano Machines are already invented, but they are at most generation 3 or 4, while the MCs Nano Machines are generation 7. In addition, the martial arts also declined and MC as the OG OP Demon G** is basically unrivaled as the one who whield original intact martial arts and his nano machines can control all technology around (and I think that also includes some other nano machines inside other people).
MC finds out that his descendants, while still hold power, gradually declining and also went astray and even plotted against him. Turns out that the guy who time traveled to the past couldn't leave, so he secluded himself in some cave for hundreds of years and was working on some stuff. But he couldn't do that alone, so he found himself a helper and also built a computer with an AI to help him do his research. But that helper betrayed him and the AI decided he wanted to be properly alive and went all evil, partially taking over the world in the future. So MC goes on a mass-murder spree and basically ennihilates all enemies in the future, helps his descendents recover lost martial arts and training methods and sets his family on the path of world domination.
(comment is too long, continue in the next comment)