I really enjoyed this drama, and I really liked the casting for it as well! The story built up well and there were lots of references to previous episodes that linked really well together. The build up of the overall story line of their parents involvements with each other was quite gradual and didn't have a huge surprise ending like many other dramas would, but I liked this because I think the story came second. To me it felt as though it was more focused on the characters and them over coming the traumas they faced in their childhoods, rather than a who did it scenario. It did have some cool plot twists that were fun and the story definitely didn't disappoint. Would really recommend to watch it!