List dramas that you watched more than 3x each?  For me among all I watched and there were plenty of them I can't seem to stop watching LIE TO ME. There is something about this one that it never gets boring. I believe I watched it like 7x. :) Other dramas were watched about 2x only at most, so you can imagine how much I love Lie to me :) 
I've watched Goong and My Lovely Sam-Soon at least 6 times (yikes). Coffee Prince, Sungkyunkwan Scandal, Shining Inheritance, Full House, MARS, My Girl, and Long Vacation are others I've re-watched quite a lot.
I'm Sorry, I Love You
Goong
It Started with a Kiss/They Kissed Again 
Legend of Condor Heroes (2008)
Bridal Mask- 3 times
Hana Yori Dango 1 and 2 (more than 8 times)
Nobuta wo Produce (more than 10 times)
Secret Garden (more than 4 times)
The Greatest Love (4 times)
Healer (3 times)
Cat Street (3 times)
The moon that embraces the sun
Healer
Playful Kiss all versions
I have only once watched a drama more than once and that was Boys Over Flowers... 4 times? 
and I watched the taiwanese, japanese, chinese version twice each... 

So yeah I love it and I don't care what everyone else says :P
Ningen Shikkaku
Ikebukuro West Gate Park
LIFE
Nobuta wo Produce
LIFE, Cat Street, Koukou Kyoushi 2003, Seija no Koushin, K.O. One, The X-Family, Devil Beside You.
My Girlfriend is a Gumiho, The King2 Hearts. . Watched those two for more than 3 times within the last 6 months.. XD .. because I really miss Lee Seung Gi already. 
School 2013 and Healer <3 I don't even know how many times I watched this Dramas xD <3
coffee prince and boys over flowers like 5times-i just love the two films. 
Queen Seon Duk
Healer
Secret Garden
Brain
You who came from the Stars
The Moon That Embraces the Sun
Dream High

i think I just listed my fave dramas here.. Hahahaha