My favorites as they stand now:

1. Another Miss Oh
2. Age of Youth
3. Dear My Friends
4. Signal
5. That Winter, The Wind Blows
6. The Princess' Man
7. Moon Lovers: Scarlet Heart Ryeo
8. Kill Me, Heal Me
9. It's Okay, That's Love
10. You Who Came From the Stars
My Best Drama So far:
1. Cruel City
2. Chuno
3. Beautiful Mind
4. Fated To love you Korean
5. My Love Eundong
6. Age of Youth
7.Winter Sonata
8. Smile You
9.TwentyAgain
10. The Princess Man

I started to watch A tree with deep roots.. Maybe it's a contender.. :)
I needed to see my favorite drama list because I made it with all my heart jajajajja It's sooooo difficult Q.Q when I see my list I always want to change something!! add some other u.u only 10 *sigh*

1. Hana Yori Dango
2. Kill Me Heal Me
3. A Gentleman's Dignity
4. Nodame Cantabile
5. Reply 1997
6. Rooftop Prince
7. Kisarazu Cat's Eye
8. LIAR GAME (Jap ver)
9. Nine: Nine Times Time Travel
10. Akihabara@Deep

I also want to name: Death Note (2015), Hana Kimi jap ver, High & Low, Keizoku SPEC 2, Gokusen
1)cruel city -best  crime
2)w -best  different  story
3)the greatest  love
4)history of salaryman
5)secret-best  melodrama
6)my  girl - best  ost 
7)secret garden
8)signal-still  watching
9)kill me heal me
10)healer 
Top Ten:

1) Punch (2014) Korea
2) Kamisama Mou Sukoshi Dake (1999) Japan
3) Scarlet Heart (2011) China
4) Prince of Lan Ling (2013) China
5) Too Late to Say I Love You (2010) China
6) Heart to Heart (2015) Korea
7) Koo Gum (2013) Thailand
8) My Rosy Life (2005) Korea
9) Tam Hua Jai Pai Sood Lah (1996) Thailand
10) Lipstick (1999) Japan

Bonus: Wu Xin: Monster Killer. This show was so pretty to me lol. I don't know why it was so pretty maybe the leads, but I genuinely enjoyed it. 
For this moment I would make a list of these titles:
- Healer
- W - Two Worlds
- I Hear Your Voice
- Cheese in the Trap
- Pinocchio
- Kill Me, Heal Me
- School 2015: Who Are You
- Let's fight, Ghost 

I haven't watched many so far but I'm trying to catch up quickly ;)

My top 10 dramas so far:
1) Signal
2) It's Okay, That's Love
3) Jealousy Incarnate
4) To The Beautiful You
5) Who Are You: School 2015
6) Page Turner (a special but I hope it counts)
7) Emergency Couple
8) 1 Litre of Tears
9) Kill Me, Heal Me
10) She Was Pretty

I'm quite new in the dramaworld so I haven't watched that many kdramas yet, though I still thought this would be a fun thing to do ~ ^^
1. W Two Worlds
2. Moonlight Drawn By The Clouds
3. Scarlet Heat Ryeo
4. Splash Splash Love
5. Cunning Single Lady
6. Kamisama Mou Sukoshi Dake
7. Marriage Contract
8. I Need Romance 3
9. Goong
10. From Five to Nine
My top 10

1. Queen Seon Deok
2. Secret Garden
3. White Christmas
4. My Love From Another Star
5. Healer
6. Cruel City
7. Oh My Ghost
8. Signal
9. Brain
10. Reply 1997

The first 9 are really, really, really my favorites. Drama on the last spot has been changing from time to time. 
1. Healer
2. It's Okay, That's Love
3. I Hear Your Voice
4. School 2013
5. White Christmas
6. My Love From Another Star
7. Shut Up! Flower Boy Band
8. Flower Boy Next Door
9. Pinocchio
10. I Need Romance 3
JDrama fan here :)

1. Rich Man Poor Woman
2. 35 sai no Kokousei
3. Doctor X 
4. Dear Sister
5. 99.9: Criminal Lawyer
6. Nobunaga Concerto
7. Hana Kimi (Japan 2007)
8. Gokusen
9. Hana Yori Dango
10. Tenno no Ryoriban