1. There is a problem with the water in the sanatorium. There are eel eggs in it (you say it is eel, so that's it), which will lead to parasitic worm eggs. When there are worms (eels) in the body, malnutrition will occur, resulting in tooth loss. , slow neural responses, hallucinations, and chronic dehydration. This is causality.
2. The big boss was a baron many years ago who wanted to rape his own daughter. Regarding the legend, because of the footage, it should be that his sister was not infertile, but gave birth to many deformed children. In the end, only this girl survived. Both are anti-aging through human oil vitamins.
3. The male protagonist almost died in the water jug. I always thought that the nurse did it on purpose. She deliberately stood there to block the window and attract the attention of the caretaker. Later, no eels were swimming away in the water. Like in toilet tanks and toilets, not hallucinations.
4. The laugh at the end, I really suspected that the male protagonist became the big boss, but when I recalled that he died, there was no such time.
There are still many problems that can't be explained, and I can't agree with other analysis. I'll look back later.
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