Romantic Crime or Spy dramas

I'm just beginning to watch this genre, and would like some suggestions. I've loved Lawless Attorney, as well as others like City Hunter, Rookie Agent Rouge and When a Snail Falls in Love. I know this is quite a broad topic and, as there are so many dramas, and I am a romantic-drama-junkie, I would appreciate it if was also a Romance. I don't mind what country it's from... thank you guys if you can think of any!

love me if you dare

when a snail fall in love  

age of legend airing

lawless attorney

mask

medical examiner dr qin

medical examiner dr. qin the survivor

meet me @ 1006

the smile has left your eyes airing

two weeks

you are all surrounded

black

come and hug me

cruel city

cubic

descendant of the sun

guardian (supernatural power)

memory lost 1-3

my heroes series 1-4

secret

the crown princess

the k2