Sismance/Girl Group/Girls Friendship with elements of thriller/crime/mystery/suspense

Hi! 

Can someone recommend me a show Korean or Chinese about a girl group/sismance/girls friendship, female centered plot with a hints of thriller/mystery/suspense/crime?

I have seen Green Mother's Club, Mistress, Age of Youth and Avengers Social Club! 

I'm looking for something similar possibly more mature content than Age of Youth.