Before reading the following guesses, you'd better watch "Birthday Present", which is also an old-fashioned thriller. If you haven't watched it, just read my guesses below. In short, the film is definitely worth watching, if you like thrillers, you must watch it, and if you don't like it, you must watch it.
Maybe that doctor was the apprentice of the doctor who treated Walter's mental illness, and has been spying on him. Maybe Walter's first doctor suspected that it was strange for him to commit suicide, and then sent his apprentice, Walter's second doctor, to monitor him. He, until the mystery is revealed) When the apprentice doctor met Walter's wife for the first time, he told her everything about the wife. It was also an intentional later photo for Walter, just to get Walter into it. It was a cure for poison, and the sports car was also part of the treatment plan. Another possibility is that his wife is also a psychiatrist, fell in love with Walter during the treatment period after Walter's first suicide attempt, and helped Walter recover with his colleague, Walter's second doctor, the whole story is It was a game set up so that Walter would first remember cruelly and then save himself with love. Hehe, I feel that my analysis was clearly influenced by "Birthday Gift", I recommend everyone to watch that film, it's a classic as it ages!
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