In no particular order:
1. Que Sera Sera
2. Call of the Country
3. Lawyers of Korea
4. City Hall
5. Smile, You
Argh, must it be only 5. There are so many more I'd like to list.
Like Family's Honor, Invincible Lee Pyung Kang, I Really Really Like You, Stars Falling From The Sky, Tamra the Island, Thank You, The Greatest Love, The Vineyard Man, When It's At Night, Who Are You?
Probably the most used and my favorite set up in Korean dramas. There something satisfying about watching two people fall in love while bickering. *sigh*
I hope I don't get in trouble for listing wayyyyy more than 5. *hides*