This is what I call a amazing dorama.
Sky Castle is a dorama when you thing is going really high, they climb higher and make you be more than surprised. I remember when I watched it was at least one plot twist by episode.
I really recommend you to give a try. Sky Castle is a type of drama that every single character you need to keep an eye open because they could turn your hope into angry. This was a nonstop watching dorama, once you start you get addicted to the point you only think about what will happen and with who.
All of the families and his stories are really interesting. Each of one have your own feeling but make us rethink about how we should treat our family.
The OST was also amazing. I'm not the type of person that keep listening to the soundtrack once I finished the dorama but "We all lie" keeps in my mind everytime I remember of Sky Castle. The best OST I ever heard.