The film is about a very shy and mentally downtrodden person.
He cannot say “I”, he cannot say directly what he wants, what he likes or dislikes, he cannot demand compliance with agreements, etc. As they say, they cannot defend their borders.
In any interaction with people, he immediately surrenders his borders in advance, when no one has even encroached on his territory. Just out of habit, because from childhood he was bullied by toxic parents.
Of course, he is very angry with this loss of energy and constantly "explodes".
The mental component of therapy in the film is complete nonsense. The patient has no problem with anger management. He needs to learn not to control anger, but to defend his limits, and anger will not arise. His problem is not that he exploded. The problem is that he got into a state where he exploded. Secondly, the doctor does not provide any therapy, he only trolls him and gnobs even more. This patient should be taught to express their strength, not to restrain their emotions. He is so restrained that he has already reached the limits of mental deviation. But the doctor shows an example of a healthy person, which is of course good for the patient.
And of course, the question is what a beautiful girl found in such insignificance, why she loves him and is still trying to cure him. But this is already on the conscience of a science fiction writer.
Shot beautifully, spectacularly, slightly played for the sake of comic.