I love Shin Min-a! She is one of my favourite Korean actresses. I was really ready to see this movie, the trailer looked good and it seemed like a mystery or thriller. The thing is though, I do not get most of the movie. Are we suppose to sympathize with the lead or hate her? Throughout the movie there are many flashbacks and thoughts that go through the lead's head that at times you are not sure if it is real or just another thought. The ending is what confuses me the most, like I said, must we feel sympathy for the lead or hate her? Should we feel bad because she intentionally pushed her friend down since she could not carry her back up to the surface and then regretted it or should we hate her because the goodness she portrayed was always for everyone to witness, when it came to actually proving she was a good person to her friend she always did something that benefited her and negatively affected her friend.