So let's separate the soft porn from the mystery story. First yes there is much sex in this series that Netflix keeps pushing the envelope with and many customers have been complaining. It's what made me switch from US dramas to Korean dramas since they can express sex scenes or love stories so much more romantically. I got this for a suggestion since it was foreign i presume. Here the FL watches her neighbor out her window, (who is a prostitute or high class call girl) having sex and also hacks into her security system to save all the videos. The FL meets the clients coincidently in the building snd ends up with the clients as well. Then there are sex parties reminiscent of 50 Shades of Grey.
As far as the mystery goes I found it confusing to keep track of all the different characters - this person is related to that person and that person is related to this person. Too much to sort out as there are time jumps forward and backward frequently. The only thing that saved this is that the last episode divulged everything and explained it in detail. But should you have to explain it?