Scarlet Heart Ryeo
TBH that's mostly all dramas that have romance in it xD

the K2 is a very good Korean drama that fits your description I really recommend you give it a try you can watch it at dramafever for free

the K2 is a very good Korean drama that fits your description I really recommend you give it a try you can watch it at dramafever for free

Hwayugi is literally about the main lead protecting the female land at any cost (although unwillingly at first). Highly recommend. 

the crown princess 

the k2

Paragit Ruk Series: Niew Hua Jai Sood Glai Puen

Paragit Ruk Series: Yeut Fah Ha Pigat Ruk

cruel romance

descendant of the sun

memory lost s1 to s3

general and i

goblin

my love from another star

game maya

Descendants of the Sun

Healer

K2

Dating in the Kitchen, The Romance of Tiger and Rose, Legend of Yunxi, The Blooms of Ruyi Pavillion, Mr. Swimmer, The Long Ballad, Poisoned Love, You are my Destiny

Strong Woman Do Bong Song, Oh My Ghostess, W, Cinderella and Four Nights 

 meighy:
MARS is sort of like that

MARS!! Definitely worth checking out. Fantastic drama

Also:

Healer has a very similar vibe to City Hunter

I have a soft spot for True Beauty as well