I got the opportunity to watch this animated movie through the festival Anima which held a special Korean selection in 2021.
Overall I was really disappointed.

Pro: the visual is really wonderfull.
Topic is interesting ans refreshing

Con : the story: The beginning of the story doesn't help the plot nor give a satisfactory ending. The end left me with to many unanswered questions.
A lot of scene are left to the interpretation of the public. However as I'm not familiar with the shamanism rituals and its conflict with christianism in Korea (i only have a rough idea), i felt that i could only grasp a bit of the whole picture.
The story line is full a flashback, ans jump in time. You'll nees to stay focused.
The music : the music itself is not bad. The problem is that there were too many songs that at some point i thought that it was a musical.