This was painfully mediocre, and using that word is still a compliment taking into consideration the quality of this movie.

The plot was not paced well. I didn't care about the background story, since it was not gradually presented in an interesting way. There is nothing fresh nor groundbreaking about this concept, so one could at least expect amazing execution.

Technically speaking, the movie could still be interesting, if it had a well written set of characters. The Chosen: Forbidden Cave, sadly, presents us with empty shells with no interesting traits. A good majority of the cast has a low level of energy, and the only character that presents a semi-personality is Joo Hye In, but even she has been toned down to just a background witness of the plot. While the cast is doing a good job, there is not much to the characters in the first place.

The soundtrack was questionable at least. The final confrontation became comedic with the choice of background music for it. Not to mention the CGI. The design for the demons was just a tragic miss.

Overall... don't watch it. There are better horrors that revolve around shamanism.