Dramas with traumatic past or psychological issues

kill me heal me
its okay that's love 
beautiful mind 
cheese in the trap (i guess?)
i remember you
moon lovers: scarlet heart ryeo 

I would recommend the 2016 Chinese drama "To Be A Better Man". 

The male lead is borderline suicidal because of the traumas of his past and his actions. He also has a loss of senses due to psychological issues.
The drama also has several fascinating female characters that you would never find in a Korean drama, with major flaws and personality issues.
Also, the ending is positive and quite inspiring!
:)

Kill me heal me 

It's ok, that's love

Can you hear my heart

What's wrong with secretary kim

It's okay not to be okay

Flower of Evil