As the plot enters the latter part, the heroine kills her boyfriend's brother. But the police found out that her boyfriend was imprisoned by his brother, which created another possibility: "Is it the boyfriend's arrangement to let the outside world know that the transparent person is not him, and then get rid of the crime." that is to say, the flip in the plot creates the complexity of the boyfriend's scheming.
But things are not that simple. If you read ghost mannequin effect the details of the story, you will find a blind spot. The transparent man killed his girlfriend's sister in public, framed his girlfriend into a mental hospital, and monitored his girlfriend in the hospital. From then on, the transparent people were ready to be exposed, so they didn't kill all the guards. Of course, it is also possible that the guards were not killed on purpose to create the possibility that the murderer was someone else, but the result was the same. This resulted in a situation where the police were asked to investigate the existence of the transparent clothes afterwards, and what was the result of rescuing the boyfriend? That is, let her boyfriend's brother become a murderer and go to jail. Let me ask, is that boyfriend's brother stupid enough to go to jail without causing trouble?
If it is said that the boyfriend and the boyfriend's brother committed the crime together, they should act in batches. It was her boyfriend who was in the hospital, and it was her brother who ran to try to kill the policeman's daughter, so he accidentally hung up. There must be a third accomplice, otherwise, the boyfriend cannot be locked in the basement of the mansion (because the environment cannot be imprisoned by itself). This is also the foreshadowing of the european and american film review estimates that there will be a sequel.