Favourite Long Drama (over 20 episodes)

I wouldn't call 20 super-long, haha.  My top/best over 20 ep dramas:
Bridal Mask (28)
Ojakgyo Brothers (58)
Chuno (24)

Taiwanese
Love Now (72)
Just You (21)
Love Cuisine (22)
Love Cheque Charge (74)


Chinese
My Amazing Boyfriend (28)
Ice Fantasy (62)
My Girlfriend's Boyfriend (32 - currently only 16 have aired, not sure why they've split them up)
Ode to Joy (42)
Ode to Joy 2 (55)
Across The Ocean To See You (44)
Magic Star (51)
Les Interpretes (42)

Korean
Lovers In Bloom (120 - currently airing)

The following are good as well but I cant say they're my favourite because I had to drop them. People might still enjoy

Korean
What Happened To My Family (53)

Chinese
The Starry Night, The Starry Sea (32)

A lot of the older classic kdramas are 20+,  like You're Beautiful, Secret Garden, etc

I also liked King2Hearts

I haven't seen that many Dramas that had 20+ episodes. Most ended with 16 o,o 
but one that I really enjoyed and just finished yesterday was Lookout. Masterpiece

The Legendary Witch
Jejoongwon
I Have a Lover (it's not that unique but Kim Hyun Joo's acting got me hooked)

I loved Monster too

Ten Miles of Peach Blossoms (58)
Love O2O (30)
Empress Ki (51)
My Sunshine (32)