I'll start with the positives first. Acting was phenomenal, and so was the directing and cinematography. Loved the music too. Story also made sense and characters didn't make dumbass mistakes usually seen in horror movies. It was fairly entertaining and kept me at the edge of my seat as well. I'm not a fan of jump scares and I'm glad there weren't any.

Not so good: If you're not Korean, you'll probably have a hard time understanding the context. The whole metal stake thing was confusing to me and I had to google it separately to understand what the heck was going on. The Japanese demon(?) thing was poorly explained as well - like what was it, why was he cursed by the monk and buried with that Korean dude who supposedly was loyal to the Japanese colonial administration etc. Kim Go Eun's character was also badly fleshed out as well. her backstory was close to non-existent and we know almost nothing about her other than 1. she's a shaman, 2. she speaks Japanese, 3. she has 2 sisters. Like why does she speak Japanese? Did something happen in Japan with some Japan ghost? Why did she become a shaman? She's advertised as the lead so I'm not sure why we know so little about her. Setting up for a sequel maybe? Who knows. As a result, it was pretty hard to relate to the characters since we barely know anything about them. I was watching solely based on the plot and wanting to know why and what was happening, which honestly left me with more questions than answers. The demon CGI wasn't great and broke the immersion too. I much preferred the first half when it was about the grandfather's angry spirit.

Overall, this is a fairly entertaining movie that I do not regret watching. However if you're not Korean it might be difficult to appreciate the nuances in the plot.