It's an amazing movie. Very gd story and awesome acting.
It questions our humanity that is it necessary to turn evil to defeat evil.
When a person sees that there is no good in remaining a Good person then he turns evil....real evil and that's what the lead actor potrays. But still even when the Evil captures our body it's unable to seize our soul and
Traces of humanity is still left in us no matter how evil we became. This side is represented beautifully in the end of the movie when the lead actor starts to cry after analysing his deeds.