@ViolinGal Yooooo ~
**Bad Guys - I can't remember it too well but I remember that I enjoyed it a lot, and I'm still holding on for a second season. The characters were interesting and the acting was mostly great. I think the female lead was a little disappointing/annoying but there's really no focus on her (or romance in general).
You were recommended "A Millionaire's First Love" by another user and I recommend it too, but it was the first Korean movie I watched so I'm biased.
***Good Doctor. Man, the praises I have for this are endless but I'll keep it short: Joo Won's acting was phenomenal. Apparently the medical procedures were executed mostly correctly too, which is cool. Moon Chae Won (that's all I need to say, right?).
Punch... I think I'm biased again, suggesting this; Kim Rae Won is one of my favourite actors. The older (as in elder) male cast is also great. The story is quite heavy and focuses a lot on law (both the legal and illegal). It's a drama that requires you to pay attention, but it's interesting so paying attention shouldn't be difficult if you get sucked in.
Scarlet Heart is great if you can get past the hair.
***The Man From Nowhere... I hate movies but I can't even recommend this enough. All actors are great, very interesting premise, Won Bin cuts his hair eventually dw, amazing soundtrack. But gory x100. If you don't like that kind of thing... well, yeah, maybe... don't watch this.
One that I don't recommend from your PTW list is "May Queen" which was great when the child actors were leading, but fell flat with the adult cast (i.e. most of the drama)