Honestly, I was a little confused with the high Google ratings. I'm pretty sure it's because Park Shin Hye and Yoo Ah In have a big fanbase so their fans are eating this movie up as if it's some masterpiece.
Anyways, this story had a lot of potential but ended up being nothing special. Too many plot holes, no thrill factor, lackluster and predictable ending. Yoo Ah In acted well but that's about it. Over all, don't watch it, I wasted my time.
And to the people that are hyping this up so much, please be honest to yourself and accept the fact that this is not a great movie.