i have to say, the koreans know how to make a good movie. i think that for every 10 i watch maybe only 2 are bad and the rest are all very good. this particular movie was no exception. it was a very well made movie with a very good cast. the girl that plays the missing little sister is probably one of the hottest acting commodities in Korea right now. she is a great actress already at such a young age. there's at least 2 other movies that she was the main lead that i can recall and both were even better than this( sunny and hansel&gretel ). she could have won awards for either one of those movies.
hmmm..., what genre to put this movie in? it has got elements of religious fanaticism, supernatural elements, eastern Asian mysticism, a decent detective and mystery story...oh well, who cares...it is just a good movie that is all. the movie was paced fairly well and the story was not too convoluted. it wasn't too scary or creepy to me like some reviewers have said, although i think it will scare some people.
i personally enjoy these types of movies with east-Asian mysticism, Christian fanatics and supernatural elements and it was a fairly entertaining movie and i always wanted to find out what was going to happen next.