Pretend to be a couple

Inborn Pair
1% of Anything
Full House
Lie To Me
Family's Honor
Delightful Girl Choon Hyang
Creating Destiny
Wonderful Life
Prime Minister and I

I've watched much of them, I'll check the rest.
Thank you very much ^^

And I was just thinking I forgot to check your list :P I'm glad you like it too though <3

Maybe you like My Pig Lady. It's not like they pretend to be a couple from the beggining. He is trying to teach her how to act like a rich lady and sometimes they pretend to be a couple. They don't get along well though, but they slowly starting to like it's other. In my opinion, it's not as perfect as Love keeps Going, but it's good ang Mike He is starring on it too :) 

For this kind of story, Nagareboshi is my fav Japanese drama and Dalja's Spring for Korean

Marriage Not Dating?

Full House
Lie to Me
Mary Stayed Out All Night