Nirvana in fire might be good; but it is not in english.
Are you saying although you have amc subscription it still wants to charge you per episode?
What kind of s… is that? No wonder their service is avoided by many.
Anyway, if very good martial arts with rich, fat and not silly story is something you need, I have to suggest Nirvana In Fire. This one is available legally on Rakuten Viki (freebie with advertisments):
https://www.viki.com/search?q=nirvana in fire
Note also that while imdb is as usual ignorant and states this is just drama, it's according to mydramalist a mix of genres: Historical, Romance, Drama, Martial Arts, Tragedy, Political.
Remember when I got mad because stupid imdb does not have tragedy tag? Yea, well, some others probably heard me.
I didn't watch the second season which is supposed to happen 50 years after the first one. Yet.
At the same site you can watch also Six flying Dragons.