If you want to watch this for Hyun Bin, good choice because he is captivating in this until the very end.
If you want to watch this for Ye Jin, she did a good enough job with what she had.

On to the review, this movie keep you entertained quiet well. Aside from our two leads, however, no one else is interesting or worthy of paying attention in terms of character. Going in, I assumed I would get more of a villain versus hero situation not politicians and police are all fucking corrupt deal. Everyone was literally playing into Min Tae Goo's hand that it annoyed me that they gave him redeemable qualities near the end. He is still not a good guy but when you compare him with the extremely disgusting politicians/police who put hostages lives on the line, murder as they please, and then cover it up, Min Tae Goo is a real anti-hero.

Chae Yoon could've just played a cop rather than a negotiator because when she need to check her emotions the most, she failed miserably. I mean, I guess that is one of the reasons she wanted to quit because she clearly isn't cut out for that line of work. She did the best she could though given how freaking corrupt nearly everyone was around her.

If you are looking for a semi-thriller movie, this is worth a watch.