Death of a Shadow (movie, 2012)

Soldier Nathan died during World War I. A strange collector imprisoned his shadow and gave him a new chance: a second life against 10000 captured shadows. It is love that guides him, as his purpose is to meet Sarah again, the woman he fell in love with before he died. But then he discovers that she's already in love with someone else, jealousy clouds his mind and pushes him towards a bitter decision, not without consequences.