Reflection Ending Explained [SPOILER!]

SPOILER ALERT: the following article contains massive spoilers, including the ending. If you have not yet seen the movie, proceed at your own risk, or better, come back to this article later!

SPOILERS AHEAD

Reflection Plot Summary and Synopsis

In 2014, Ukrainian surgeon Serhiy enlists to fight Russian military forces in the Donbass region, where he is captured by enemy soldiers. Now a prisoner of war, Serhiy is forced to witness horrifying scenes of humiliation and violence at the hands of the Russian invaders, his medical background co-opted to dispense mercy killings to the tortured. After his release, he returns to his comfortable middle-class apartment, still suffering from the trauma of his experiences. Looking inward, Serhiy tries to find a purpose in life by rebuilding his relationship with his daughter and ex-wife, learning how to be a human being again through being a father.

Source: Wikipedia (CC BY-SA 3.0).