How did Orhan, a down-to-earth family man, turn into the killer of his coma-stricken mother?

　　1915年澳大利亚参加一战后，两名在澳大利亚卖冰激凌的土耳其人决定为祖国而战

　　Umut, a young man who is mute but not deaf, finds out that his mother has been meeting with a stranger.