Dramas you watched multiple times

only the classics like nobuta wo produce, 1 litre of tears, hanakimi, hana yori dango/bof, my boss my hero & atashinchi no danshi because these are the gems that got me into dramas so i like to revisit them from time to time.

Moon Lovers: Scarlet Heart Ryeo
The Princess' Man
Rooftop Prince
Doctor Stranger
Emergency Couple
Sungkyunkwan Scandal

eternal love
you who came from another star
descendant of the sun

Eternal Love
You Who Came from the Stars
My Girlfriend is a Gumiho
Sungkyunkwan Scandal
The Master's Sun
Rooftop Prince
Pinocchio

secret
innocent man
fated to love you
descendants of the sun
oh my venus
 

I rewatch dramas frequently, this are the ones that i rewatched full and in order, but if i considered the times i watch just random parts the list would be much bigger.

5+ times : 
Reply 1997 (2012)

2-3 times:
Empress Ki (2013)
Prime Minister and I (2013)
Six Flying Dragons (2015)
You Who Came from the Stars (2013)
Deep Rooted Tree (2011)

At least 1:
Another Miss Oh (2016)
Drinking Solo (2016)
Itazura na Kiss - Love in Tokyo (2013)
Moon Lovers: Scarlet Heart Ryeo (2016)
My Wife’s Having an Affair this Week (2016)
Secret Garden (2010)
The Heirs (2013)
The Producers (2015)
Uncontrollably Fond (2016)
You're Beautiful (2009)

A Love To Kill
Another Miss Oh
Arang and the Magistrate
Boys Over Flowers
Chief Kim
Cruel City
Fated to Love You (Korea)
Fated to Love You (Taiwan)
Flower Boy Ramen Shop
Goblin
Goong
Healer
I Need Romance 3
I Remember You
Innocent Man
It Started with a Kiss
It's Okay, That's Love
Kiss Me (Thailand)
Kleun Cheewit (Thailand)
Kou Kou Kyoushi 2003
Legend of the Blue Sea
Lucky Romance
Marriage, Not Dating
My Girlfriend is a Gumiho
Oh My Venus
Queen In Hyun's Man
Reply 1988
Strong Woman Do Bong Soon
The Devil
They Kiss Again
Tomorrow With You
Weightlifting Fairy Kim Bok Joo
You Who Came from the Stars

I rarely re-watch dramas...

Nirvana in Fire
Healer
Empress Ki
Goong
Boys over Flowers