I love Chae Soobin, I watched the movie only for her. I might be biased but she carried the movie on her back by successfully keeping the audience's sympathy with her character until the very end.

40% of the movie were montages of the guy cheating that contributed nothing to the plot.

Overall, watch it if you're bored as hell and have absolutely nothing else to do. The movie doesn't make you laugh, doesn't make you cry, doesn't have any thrill element, only fills you with dread at the characters' bad decisions and their audacity to behave the way they do, worst of all, it all seems too realistic to brush it off.

The twist was unexpected and made the movie worth something. Would I recommend it to anyone? A solid no.