This a really great movie. Its interesting to see how each of the 4 couples relationships remain throughout the 2 years that they are separated due to their military service. Couples you expect to stay together, break apart and couples you expect to dissolve surprisingly flourish. I loved the entire cast but especially enjoyed the performance by Jang Hee Jin ( can be seen in Spy Myungwol) because her character was different than what i'm used to seeing from her other roles. My only problem with this movie is not enough Jang Gun Suk lol. No but really this movie is really interesting and has a cool cast of characters. I loved it and will easily watch again!