In North Korea, the general Jang Seong Taek is killed. One day, the North Korean Government requires the reactivation of one of their spy, Park Hye Rim who has spent a lot of years in South Korea as an ordinary housewife. Her mission is to turn and bring her own son, Kim Seon U in North Korea. Seon U, a quick witted genius but also a very warm person with the ones he loves, is an information analyst on North Korea who works for the NIS (National Intelligence Service). His girlfriend Yun Jin instead is a tour guide for Chinese tourists, even though she can't speak Chinese. The two of them will fall in love when Seon U will help her with the translations.
Suddenly Hye Rim will be forced to choose between her son and country.
Spy has an interesting plot that should have you on the edge of your seat. Unfortunately, it doesn't manage to wholly succeed. However, the show does stay somewhat interesting.
The premise of the show - a loving mother/son duo caught on opposing sides, trying to protect each other without revealing anything - is something that should have been taut with tension. There should have been a fast paced story, emotional tugs on the viewers hearts, and a villain that seems undefeatable. Spy has none of those. The story jumps right into the premise, but then lingers. There's a lot of exposition, little action and the key points are, frankly, not very important.
So while the acting is great, you don't get the sense of urgency that the show is trying to portray. The big bad isn't that big, and you wonder if the characters are really as good spies as constantly mentioned.
That being said, this show has one of the best family units around. The parents have an amazing marriage, and they deal with the problems as a team, which makes you root for them if only because anyone this happily married has to make it through.
A good watch to see Jae Jung's improving acting and for any fans, not such a great watch for fans of the spy genre.