Waste of time, audience is already on the edge of the seat guessing who is the killer only to find it in the climax to get shocked or satisfied with the guess, but this movie never full fills that climax, atleast leave a hint or some clue but no, dead end without revelation. The movie is inspired by Korean movie and even there the killer is not revealed but that is because it is based on true story and when the movie was made the killer was not yet caught, after six years the killer was actually caught.
Anyways I would have given 1 star but giving 2 star because if the performance by actors. Good acting, bad ending.