Same problem as 'The Eye'
This is nothing like "The Eye" plot-wise really, but it is like that earlier Pang brothers movie in that it starts out really well, but kind of falls apart in an ending that is too long and only belabors the things that are obvious while making the things that are confusing more confusing.
I liked this movie, but it could have ended ten or fifteen minutes earlier (when the first credits appear). Nothing that happened after that made the movie any more clear or any less ambiguous.