She likes dark stuff huh so maybe
Voice (it has 3 season but it just continues aaand there are just a little changes regarding the actors)
Liar Game (there is a japanese version but also a korean, I personally did like the japanese more thou the korean was okay too) it is more mistery
Prison Playbook the plot was really interesting, and the characters were all well-played, there were funny scenes and some that made you cry ( I really did cry at one particular scene thou I am not going to spoil anything :P )
Whisper power and corruption rule the world and the protagonists try to make justice win
The Guest this one is supernatural the main leads are a priest, a taxi driver who can see spirits(ghosts whatever you want to call them - he can see when humans are possesed and he needs the priest to exorcise them) and a police offficer. The drama was interesting and you were like thinking who is the main bad guy till the last episode
Misty you have a VERY strong FL. it is dark and the story is more mature
Hope you will like some of them~~~