If you have seen a lot of kidnapping movies (The Man from Nowhere, Mercy, Taken), Montage is just about the same.
BUT, the story is well-presented and answers all the questions. It kind of refreshing to have such a clear ending.
The story tells us how a mother of a lost child is dealing with her lost and never lose hope to look for justice. And also the detective who's having a hard time accepting the fact that the criminal slipped of his hand.
Eom Jeong-hwa and Kim Sang-kyung performance were unquestionably good. Eom had played the same role before and so did Kim.
Overall, I give a 9 because it's been a while since I saw a kidnapping movie and I'm glad that it doesn't make me stop midway and start thinking "Where have I seen this before?".
Totally worth your time.