Okay, first thing first. I was curious to watch this because of Song Ji Hyo (not a big fan here, but I'm just curious about seeing her acting after the last movie I saw, Code Name Jackal).
It's more natural here I think.
I like the flow, fast yet clear. Every actor delivers the role naturally just like it was themself in personal. Not too much, not lacking. Just, right. The chemistry also right. Just right.
It's entertaining, refreshing, but somehow, it just.. flat.
Just like eat an ordinary fast-food meal on your cheat day just because you don't have time to go to a fancy one. Once is enough.
I don't think I have to watch it twice.. or for the worst.. I don't think I will recommend it urgently if you want something very refreshing.
The only thing that quite quirk is the sex scene and another so-called hot scene. It seems more comical than sexy that leave you smirk instead of big laugh. It's more like satire, just like the whole movie.
But,
I guess people really need exaggeration in a movie to fully understand the message; that cheating - no matter how good you are or for whatever the reason is - just make your life uneasy. Just like pyramid scheme.
Nevertheless, people need more movie like this, to make a subtle memory about everyday life problem that seems 'normal', to settle in their brain and make short bright-yelllow-post-it note in deep down their brain memory, that.. cheating (again) is never good eventually. ;)