OP MC

The MC has a machine called nano(which helped him to be strong) that was inserted to his body by his descendant from the future.
100/10 Visuals
Brain and Brawn
No harem but there's a potential FL but she's strong.
Revenge plot.

It's a master and disciple.
The master is disguise as a cant but the truth is he is a hunk and a psycho who is constantly challenging the top 10 strongest in the world.
There's a potential love interest which is the sister of his friend. But don't worry because she's strong. Stronger than the MC actually and she's friggin rich.