I'd like to second the recommendation on 'Legend Of The Condor Heroes'. The ML is well-known for being dumb and slow but he's hardworking, loyal, righteous and kind. The FL is the clever, talented and sharp one of the duo.
There are several versions but I'd highly recommend the 2017 version here: https://mydramalist.com/19556-the-legend-of-the-condor-heroes because of its faithfulness to the original source material (i.e. the Jin Yong book) and because the visuals, the actors and the martial arts scenes are really well done. It's also very new so the video quality is sharp and nice.
I've seen the Hu Ge, Ariel Lin and Yuan Hong version but was not impressed with how much they deviated from the story in the book. It watered down a lot of the main conflict, gave incorrect background and plot progression and basically didn't really do the book and the epic story justice at all.