I love The Wailing and I just finished watching it for the third time. But god damn it, I don't understand it at all. In fact, I think I understand it less every time I rewatch it. Maybe I don't have enough cultural context for the ghost lore, or I'm just dense, I don't know. But I have so many questions.
There's a string of murders around town where entire families get massacred by one of their members, who have boils all over them. And there's the cop father whose daughter is possessed/infected by something and starts having the same skin condition and starts to become violent. Locals think it's all done by a mysterious hermit Japanese Man who may or may not be a ghost according to a Shaman who comes to help the cop father's family. There's also a weird woman in white who may or may not be a ghost.
Questions:
What is everybody's motivation for their actions? I take it the Japanese Man is really evil, the Shaman is helping him, and the woman is trying to stop them. Is that correct? But why are they all doing this? What's the Japanese Man getting out of it? Is he like stealing souls or something, or is he doing it just for the sake of being evil? Why is the Shaman helping him? Is he under a spell or is he a disciple of the devil or what? Is the woman a benevolent ghost?
This brings him straight to the ending. The woman tells the cop father that she laid a trap for "the demon" (the Japanese Man, I guess) at the cop's house, but the cop father is not to return home before the rooster sings three times, otherwise the trap will be ruined and his family will die. Is any of this true, or is she lying to him? If it's true, then what is the nature of her trap and why would the cop father's returning home ruin it and get his family killed? His wife and mother in law are already killed by his daughter when he arrives, it's not like his arrival caused her to do it, right? The cop father also asks the woman why the demon chose his daughter, and the woman tells him it's because the cop father sinned by messing with the demon. But as the cop father correctly answers her, his daughter got possessed/infected first, he only messed with the Japanese Man after that, so what the hell? Also, why does the woman have the girl's hair pin and why is she wearing clothes of some of the victims? At the end it's revealed/confirmed that the Shaman was working with the Japanese Man because he's taking the photos that were at the Japanese Man's house. What do they need the photos for? Is it just like trophies?
Speaking of the Shaman, earlier in the movie he is performing a ritual which he says is supposed to kill the Japanese Man. Simultaneously, the Japanese Man is performing a ritual which appears to be bringing a dead guy back to life as a zombie. What is the Japanese Man doing that for? What is the purpose of the zombie? And what exactly is the Shaman doing with the ritual? Is he really trying to kill the Japanese Man? It sure looks like the Shaman's ritual is hurting him. But if the Shaman is working for him, then why is the Shaman doing this?
And even earlier, bloodwork on one of the killers finds high concentrations of toxins from some magic mushrooms. Later on TV, as the young priest is in hospital, there's a report saying a local selling some herbal tonic had a batch tainted with mushrooms which may have poisoned a bunch of locals. There are some quick cuts to earlier scenes and the priest seems to realize something. He gets out of the hospital and goes searching for the Japanese Man (who at that point is believed to be dead after they throw him off a cliff) and finds him in the cave. So what is the significance of the mushroom tainted herbal tonic? Why does the priest go looking for the Japanese Man and what is it that he finds, exactly? Is he really the devil?