It's not shocking that the majority of viewers don't understand this movie, it's honestly dark and genius. You need to have a deep resignation with selflessness, self-loathing, love and depression to truly grasp what's happening as the movie unfolds. This soldier hates himself, hates that he's alive, hates the things he's seen and gone through. He starts falling for an underage girl because he sees her as pure and doesn't want to ruin that, in fact he wants to protect her with everything he has left. He turns to a prostitute because like everyone he has carnal needs that she can fulfill but she falls for him because unlike the usual cheating, abusive, dirt, pathetic johns she's used to, she can tell he's different and that he struggles with similar internal feelings as her own. Jealousy rams rampant in every character of this story and to be honest there needs to be more character background or development to give a more well rounded vision to viewers. Ultimately the meaning of the ending is that while the father was prepared to kill the man for not loving his daughter and feeling he's taken advantage of her, he realizes that the man's willingness to die for her better good is actually a true indication of how much he does love her and how good he is. The man then decides to take his own life, saying "you're welcome" to the father before jumping from the building to signify that he knows he will never be good enough for her, that there is no changing that and in order for her to move on he has to die, but he's willing to take his own life to save the relationship between father and daughter because she would never forgive him if he killed the man she loves.
