Heartstring , boys over flower , kyou koi wo hajimemasu
Everything with Yoon Eun Hye... plus City Hunter, Faith, Secret Garden, I Hear Your Voice...well I do rewatch many dramas so it is hard to tell which one the most ;)
full house, proposal daisakusen
MARS, Down With Love, Hana Yori Dango, Rooftop Prince, and Smile,You
you're beautiful - 3x city hunter - 3x faith - 2x I hear your voice - 2x shut up flower boy band - 2x those are the only shows ive rewatched and I could rewatch any of them again they are just sooo good
There are only a few dramas that I have rewatched, but I'm sure I'll come back with more to add later.
Dramas:
Hana Kimi 2007
Hana Yori Dango
Wong Wian Hua Jai
Namtan Mai


Movies:
Moon Child
Uzumaki
Cursed
Adrenaline Drive
Infection
Gorgeous
One Missed Call
The Princess Blade
Tomie
Coffee Prince You're Beautiful Don Quixote Speedy Scandal Chilling Romance
You're beautiful and My Girlfriend is a Gumiho.
Hana Yori Dango season 1 and 2 and the movie. It Started With A Kiss/They Kiss Again Hana Kimi (2007) Love Rain Marry Stayed Out All Night You're Beautiful Vampire Prosecutor 2 Rich Man Poor Woman Bloody Monday 1 and 2 I think like 30% of my list I could re-watch from start till end again and again.
Only drama I ever rewatched so far was My Girlfriend is a Gumiho, and I probably will rewatch it again in the future, so that's all I can say for now.
I don't really rewatch dramas, but it's okay for movies, and I could rewatch Paradise Kis over and over and over again :3
coffee prince full house
The Quiz Show 2, even though it's crappy.