The drama's premise itself is very interesting. Immediately hooks the viewer and you invest in the not so likeable, suspicious main character because he is the only one you can really root for.
The cast is incredible, a wide range of actors who all manage to get under your skin with their performances.
The soundtrack is engaging. The cinematography keeps you on the edge the entire time. Its an anxious, get your blood pumping kind of watch.
Overall its deeply unsettling and and delivers on the horror aspect without any cliche tropes.