Mature/Serious/Crime/horror/Adult kdrama

Serious and mature kdrama, non cheesy/rainbow/ lovey dovey/comedy/ destiny/ rich and poor or other love that is meant to be drama [A-Z].

Warring: some of this drama can contain: US/EU PG10-12 and Korean PG15/19

• blood
• violence/ bullying /harassment  
• murder/crime
• investigation/ detective/police 
• cheating/affair
• psycho logic, Thriller
• and even ghost or supernatural 

PS: there will be quite a lot of crime/police drama because they are usually serious drama unlike romance's one