Signal

Bubblegum
Can we love?
Let's Eat
I have a lover
The Spring Day of My Life
The World That They Live In
Bubblegum

Chuno
Stranger
Romantic Doctor Teacher Kim
The Flower in Prison
A Gentleman's Dignity
Empress Ki (planning to give it a second chance)

"Stranger"! I haven't watched the others (have "Romantic Doctor, Teacher Kim", "A Gentleman's Dignity" and "Empress Ki" on my Plan to Watch list though) but if you're into crime/investigation dramas, "Stranger" definitely won't bore you! :)

The Bridal Mask
Cruel City
Chief Kim
Mirror of the Witch
Nine: Nine Times Time Travel
Chief Kim

Fight for my way
The Best Hit 
School 2017
Dream High
Love O2O
None is the great thing, but I choose School 2017!

The Best Hit
Reunited Worlds
Strongest Deliveryman
Manhole
Live Up to Your Name, Dr. Heo
n/a
cuz i havent seen any of em

A Gentlemans Dignity
Winter Sonata
Vampire Prosecutor
The Spring Days of My LIfe
Lovers in Paris
Autumn Tale
Pasta

N/A

I've already started some of these but idk if I should continue:

City Hunter
Another Miss Oh
Reply 1994
Cunning Single Lady
Hit The Top
Hit The Top

Emergency Couple
Doctors
Doctor Stranger
Romantic Doctor, Teacher Kim
Romantic Doctor, Teacher Kim

A Beautiful Mind
Criminal Minds
Defendant
Duel
Stranger
A Beautiful Mind

Chicago Typewriter
Signal
Circle
Stranger
Chief Kim
Signal 

Chiacago Typewriter
Secret Forest 
Rebel: Thief who stole the people
Circle 
Tunnel
Chicago Typewriter

Sassy Go Go
Weightlifting fairy KBJ
Fight My Way
Age Of Youth
Dear My Friends
OMG, you've got a great selection there! I would go with Age of Youth

Stranger
Romantic Doctor, Teacher Kim
Circle
King2Hearts
Tunnel
Woman of Dignity
Circle

That winter the wind blows
Scholar who walks the night
Death note new generation
Tomorrow i will date with yesterday's you
That winter the wind blows

A Gentleman's Dignity
Let's Eat
Memory
Good Doctor
Secret
The World That They Live In