There Is No Beautiful Farewell(아름다운 이별은 없다)

At a deserted cabin where no one comes around, a man carries in a young woman. He looks at the woman who is unconscious. He starts sobbing as he undresses her layer by layer. Then he has intercourse with her. What made thier relationship so tragic that he had to bring her up all they way to this lonely cabin to do this to her? And the shocking ending is...