9/10

What I like the most about this movie is that it did not portray the work of an undercover agent as cool as other movies and dramas do. This movie showed the life of agents quite realistically, and how dangerous their line of work is. One little mistake can end their life. And I liked how it also tells about their mental state. The characters' played by the agents affect them psychologically. For that, they also have to check their status with psychiatrists. I'm glad that this movie also included it.

I liked the acting, especially Tony Leung's. He has his charms. The cinematography was good.

The movie kept me on edge till the end. I really liked it.

And about the ending, I hated it with a burning passion.