It is a huge let down with amazing actors like Ji Chang wook, Kim Sang ho, Lee Hani and Oh Jung se. The makers didn't use them efficiently, especially Lee Hani's character. They gave space for 2nd part with escape of Lee Hani, if they ever make it, better come up with convincing story.
Story: it has one of the best opening scenes. Start is great with mother bonding, injustice and prison scenes make viewer's blood boil. So naturally expectations keep growing. Then you find problem in everything that happens because story went bleak and too convenient for protagonist. Then comes not so surprising reveal of mastermind who is wise but don't stand a chance against our team. My major complain is the very team, no one is memorable, didn't develop bond with team members or audience, who are they, what do they do, how do they live, why are they helping at the risk of their lives... can't convince myself that 2 hr long movie isn't enough to explain everything.
Oh Jung se's role could have been best in his career if they didn't make a joke out of it. That ending is plain dumb. Action sequences and car chases are well shot, cinematography is also good.