Good but not great

the storyline is great overall but I had a hard time feeling connected to In Joo. I’m not sure if it was the actress or her character but she was frustrating to watch.
there was a lot of suspense and the plot twists were really good but most of of could have gone so much smoother if the sisters just communicated with each other…which they never seemed to do, despite trying to give the sense they were so close. In Joo was frustrating with all her needy, “selfless”, and oftentimes stupid choices.