I still understand it, it's a big spoiler

At the beginning of the movie, the protagonist is in the virtual world. What followed were his memories: he invented a device to check other people's memories, and the police invested it. One day the police brought a suspect to test the device. He entered the other party's memory and found that the suspect shot her drug-addicting girlfriend. This is not a real memory. Later, you will know that this is because the police repeatedly used their own hypothetical truth to ask questions, repeatedly implying that the suspect confessed his crime, causing the suspect to create a false memory by himself. At the end of the test, the protagonist wants to withdraw from the suspect's memory, but he can't go back any more. His consciousness can only be in the suspect's memory. So the protagonist's body fell into a coma and became a vegetable.
The male protagonist stayed in the suspect's memory for more than 3 years. One day, the protagonist replayed a piece of the suspect's childhood memory. Once the suspect opened the refrigerator door and turned around and saw the protagonist who was observing his memory. The protagonist then tried to have a formal dialogue with the suspect. He replayed it repeatedly in a memory scene of an adult suspect, and finally let the suspect see him in his memory, and the dialogue was successful.
The protagonist told the suspect about trivial matters about himself and his wife, in order to win her trust, and asked the suspect to call his wife. His wife came to the prison, believed the suspect, and knew that the protagonist's consciousness was still alive.
The protagonist wants the suspect to help him go back, but the suspect insists that the protagonist help him find the man who knocked him unconscious at the crime scene.
In the wooden house in the forest, the police guard, the protagonist's assistant operates the equipment, the suspect and the protagonist recall step by step together, and find another person at the scene, who is the suspect's friend. The suspect interrupted the connection, escaped, found a friend, and after a firefight, the suspect was fatally shot, wounded and returned to the male protagonist's body. After connecting to the equipment, the protagonist finally woke up and regained consciousness before the suspect died.

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