8. Chan Wing-yan - Infernal Affairs
Famously remade into an Oscar winning movie in 2006 by Martin Scorsese, Infernal Affairs was one of the very best movies of the last decade, centered on the age old theme of identity. At the heart of Infernal Affairs is two cops, one is a traitor secretly working for the Triads, and the other, Wing-yan, is a police mole integrated into the same Triad gang. Played with masterful intensity by Tony Leung, Chan is embedded deep in the heart of the Hong Kong underground. Surrounded entirely by violence and deception, Chan's paranoia continues to grow as he has essentially given up his own life for this one. The deeper he descends into the Triad culture, the closer he gets to becoming the very beast he is intent on destroying.