This film is about a mysterious love letter that turned 4 people's love life upside down.
The idea of the film is interesting, and the film could have been funny. However, this film is simply what a romantic comedy should not be. The characters are inadequately introduced at first, so it gets so confusing. The supporting characters come and go without adequate reasons, as if they exist just for one particular scene and then vanish into thin air. The pacing is awfully slow, that it makes 90 minutes seem more like 180 minutes.
It could have been romantic and funny, but this film spectacularly failed to do either.