The psychopathic protagonist carefully lives his life as a writer, obsessive-compulsive, cleanliness, psychotic, and quarrels with shop clerks and throws away the neighbor's dog.
However, it was one such dog that changed his life. He forced the dog in, tried his best to make the dog like him, and even played piano music for him. Slowly the audience will find that he is not so annoying, he will want to help others, but he does not know how to do it.
Maybe the director just wants the feeling between people to gradually refine and rely on. It was such a long, difficult, or warm process.
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