**A good story with a terrible execution.**

I actually love these kind of movies and shows. I'm a big fan of horror, and I also like stories with parasites. There are a lot of potential in those ones, and they can be very scary and suspenseful, if it's well written/directed. But this show is not.

Choi Jun-kyung (the leader of the parasite hunters) is totally overacting her role. All her scenes seem like a ridiculous parody of a real horror movie.
The people that are infected (ruled by) parasites act like very slow minded persons with serious mental issues. The way these actors present the infected people are simply not believable.
The story is not suspenseful at all, it feels like it's rushed and that makes it chaotic, also making the show hard to follow and understand. I tried (wanted) to like this, but I simply couldn't.