Same overall story, a private tutor in charge is making the family we first thought was perfect, but turns out not. Kazoku game is more dark though, no romance, both of them are unpredictable. Kazoku game was the first drama that makes me question why we have to study so much, get perfect grade, good social status, just to look good on the outside. When I watch Sky Castle I got the same after taste

The same psychopath killer type of story that relates to both female and male lead. Both female and male leads develop feeling in process of finding out the truth. Although in Gap Dong there are no supernatural power that plays in the drama