I watched this for Park Shin Hye, but came out a huge fan of Jeon Jong Seo. Wow. They both acted so well.
Like people have said, it's a similar concept to the drama Signal in where there is a parallel/time travel aspect happening through a phone call. From the 2nd half on, I felt like I was holding my breath the entire time. It was so creepy and suspenseful.
Jeon Jong Seo. I get why there is buzz about this rookie actor. This is only her 2nd film and her acting is so mesmerizing. She embodies her character and has such depth in her acting. If she's already this good at the beginning of her career, I'm excited to see what she can do in the future.
Park Shin Hye is great as always. There has never been a role that I've seen her in where I don't believe that she's her character. For someone so famous, that is hard to do, but she does it so effortlessly.
I'm glad I checked this film out!