Avengers Social Club (2017) - 12 ep., genres are friendship, comedy, life
Prison Playbook (2017) - 16 ep., genres are friendship, comedy, life, black comedy
Age of Youth (2016) & Age of Youth 2 (2017) - 12 ep. & 14 ep., genres are friendship, mystery, comedy
Hello Monster (2015) - 16 ep., genres are thriller, mystery, psychological
Two Weeks (2013) - 16 ep., genres are action, suspence, thriller (I know you wrote you dont want dramas they are younger than year 2014, but this drama is really great)
When a Snail Falls in Love (2016) - Chinese drama, 21 ep., genres are thriller, mystery and less romance
I hope you enjoy some of these dramas ^^