Mask is the story of Ji-sook,a girl whose dad has a lot of debts.She look the same as Eun-ha,a fiancée of rich Min-woo.When Eun-ha dies,Seok-hoon(Min-woo's brother in law )threatens Ji-sook to take Eun-ha's place.The series is nice and the ending is satisfying.One thing I found weird is humanizing of Seok-hoon at the end,who is actually a psychopat.Very good drama.9/10. A