Upcoming JTBC drama, “SKY Castle” (formerly Princess Maker) confirmed its main cast this week, and it is everything we hoped for.  The satirical comedy about Korea’s elite mothers has lined up a powerhouse of actors and actresses.  KDrama legends Yeom Jung-ah, Lee Tae-ran, Yoon Se-ah, and Oh Na-ra have all confirmed that they will be playing the lead roles of…