The story was close to perfect. Though no other time-difference related movie can do it better than Back to the Future, this one did a pretty fair job. Of course, there were some loose ends that weren't tied. The ending was not satisfying but oddly pleasing. Perhaps it's because the good guy lost. Surprisingly, I felt little to no sympathy for Kim Seo Yeon. And of course, I didn't show support for Oh Yeong Sook either. Although the transitions were a little hard to adjust to, I think they did well. Honestly, this is one of the best thrillers I have watched. Please note that I have not watched that many movies though. I'm more a drama person :)

With the cast, there is no need to explain. Park Shin Hye? Amazing actress as always. I loved her acting in this drama. Jeon Jong Seo? After watching this, I researched everything I could about her. Too bad she hasn't had that many works out yet. I believe she will make it big one day with acting because I felt like she was perfect for this role. As for the support characters, I recognized many famous actors from other dramas (e.g. Oh Jung Se from It's Okay to Not Be Okay and Park Ho San from True Beauty, Hush, Extracurricular and many other great works).

Overall, I would RECCOMEND this movie for the genre thriller.