I have finally completely rewatched this drama over two years after first watching it, and I have to say, it really holds up. The story is very interesting, and at first I was skeptical if they could fill 20 episodes without drawing everything out forever, but other than a few minor moments in the last episodes, that didn't really happen.
I really liked the combination of action scenes, romance scenes but also the strong plot about corruption and the media. The chemistry between the leads was good, and I especially liked Yoo Jitae's character's interactions with the rest of the cast, his character was played very well and constantly kept you on the edge about his true colors.
My only real point of critique would be about the music, I know a lot of kdramas have their one love song they alwaaaaaays play for romantic scenes, and "Healer" is no exception, Eternal Love got on my nerves towards the end.
Other than that though, I really loved it and would definitely recommend it!