This is mu list:

Hana yori Dango
Nodame Cantabile
Pride
Buzzer Beat
Kill me heal me
Healer
The greatest love
1 litre of tears
Maou
Liar Game
I should make a Japanese list and a Korean list separately.
Dramas that I love enough to rewatch it from time to time :
02. Love O2O
09. City Hall
** Honorable mention : The Painter of the Wind
Not in any particular order top & not 10

1 Litre of Tears
Bad Guys
City Hunter
Cruel City
Descendants of the Sun
Falling for Innocence
Healer
It's Okay, That's Love
My Beautiful Bride
Oh My Ghost
Pinocchio
Signal
The Master's Sun

I would also like to add W - Two Worlds to the list but since there is only 6 episodes so far, can't really say for sure.
Just scroll down to search for new drama..

but i'm disappointed because this great drama is not on your list..

"Tenno no Ryoriban (2015)"

I bet if any of you watching this drama, your top 10 list will change for sure.
One of the best drama ever. A true masterpiece.
My TOP 10 (no particular order) :-

49 days (K-drama)
Ryusei no Kizuna (J-drama)
Buzzer Beat (J-drama)
Siren (J-drama)
White Christmas (K-drama)
Two Weeks (K-drama)
Shinzanmono (J-drama)
Dragon Zakura (J-drama)
Limit (J-drama)
Autumn's Concerto (T-drama) 
 
Mine (not in order)

1. Another Miss Oh (Korean)
2. Queen In Hyun's Man (Korean)
3. Boss and Me (Chinese)
4. Kill me Heal me (Korean)
5. Love Me if You Dare (Chinese)
6. The Moon that Embraces the Sun (Korean)
7. Healer (Korean)
8. Full House (Thai vr)
9. It's Okay That's Love (Korean)
10. Murphy's Law of Love (Taiwanese
1. My Love From Another Star ♥♥♥♥
2. Secret Garden ♥♥♥♥
3. Reply 1988 ♥♥♥
4. It's Okay, That's Love ♥♥♥
5. Cruel City ♥♥
6. I Remember You ♥♥
7. Nine Times Time Travel ♥♥
8. Six Flying Dragons ♥♥
9. Falling for Innocence ♥
10. The Princess' Man ♥

:) :)
here's mine (in no particular order):

1. juhan shuttai
2. nine: nine times time travel
3. battle of changsa
4. soredemo ikite yuku
5. signal
6. misaeng (incomplete life)
7. nirvana in fire
8. tenno no ryoriban
9. i hear your voice
10. 1 litre of tears
1. Nirvana in Fire
2. Koukou kyoushi 2003
3. Gunshi Kanbei
4. Beethoven Virus
5. Nine Times Time Travel
6. Orange Days
7. Ode to Joy
8. Sound of the Desert
9. Roosevelt Game
10. Kimi wa petto.

It's hard to chose only ten. My favourites list changes from time to time, but some of the titles have been in the top for a long, long time. 
It's been hard to narrow down top favourites but here's my top 10: (not in any particular order)

1. Mother
2. Soredemo Ikite Yuki
3. Orange Days
4. Home Drama
5. Densha Otoko
6. Kimi no te ga sasayaite iru
7. The Queen's Classroom
8. The Great White Tower
9. Tonbi
10. Battle of Changsha


:






miseang, Nirvana in Fire, sungkyunkwon scandal, counter attack. It's Ok thats Love, Masters Sun, Welcome to Fortune-Telling Onmyo Shop, ugly alert, Honey and Clover (taiwanese version), Tiny Times  are the ones I love most today, but to be fair, different days make different dramas my favortie ones. so this is kind of an excersize in futility. but it was fun. 
My top 10 currently in no order:

Cruel City
Masters Sun
Nodame Cantabile (all versions)
Battle of Changsha
Love Me If You Dare
Smile, You
Go Princess Go
Splash Splash Love
The Journey Of Flower
Page Turner

It does change frequently though lol
(1981 Brideshead Revisited) X 10 

( ͡° ͜ʖ ͡°)
I will update my post.. :)  coz I found a new gem..
1. Cruel City
2. Beautiful Mind
3. It's okay that's love
4. Twenty Again
5. Age of Youth
6. My Love Eun Dong
7. Empress Ki
8. Smile You
9. Winter Sonata
10. The Princess Man