Xiao Yu was known for investigating cases, but he was even better at pretending to be a criminal.
He knew how criminals thought and how they committed crimes, and he could even predict what they would do. He could even feel things that normal people couldn't.
One day, ge surprised Guo Qiang, his old detective coworker, by pretending to be a criminal.
Guo Qiang was impressed by his change, but he didn't understand how he could simulate the thoughts of criminals.
Xiao Yu explained that he was imitating the psychology of criminals to solve the case.
Guo Qiang followed him into a dormitory, but he was still unsure about how he could imitate the psychology of criminals.
He had solved countless cases by simulating the psychology of criminals.
"Let's pretend I'm the murderer..." Xiao Yu said he started investigating the room.
Xiao Yu is trying to understand why someone would follow another person out in the middle of the night, even going up to the rooftop.
He is wondering what could have forced them to do this.
He considers it because of a threat or a hate crime, but he concludes that it can't be a hate crime because the victim was a good person who had many friends.
Then he realizes that killing requires a reason, and wonders what it could be.
He imagines himself as the murderer, trying to figure out what could have made him angry enough to kill the victim.
He concludes that there must be something that the victim did to make the murderer angry, something that violated the murderer's interests.
He focuses on a possible emotional dispute between a man and a woman that led to the victim's murder.
He reasons that half of all homicide cases are due to emotional disputes.
If the murderer was motivated by the victim over money, a crime record would have been found.
If the victim had an affair or a love interest, the detective wonders if the victim angered someone enough to lead to the murder.
He then examines the possibility of the victim acting as the trigger for the murder.
He reasons that if the victim angered the murderer, the murderer may have threatened the victim to follow him or her to the rooftop.
If the victim was threatened with violence, the murderer would have prepared a weapon in advance and hidden it on the rooftop before meeting the victim.
He concludes that the victim's murder was likely the result of a carefully planned crime of passion, with a possible emotional dispute as the motive.
Xiao Yu is searching for the murder weapon, which he believes to still be at the scene of the crime.
He thinks that it would be inconvenient for the murderer to carry the weapon after killing the victim, so he predicts that the weapon is likely hidden somewhere on the rooftop.
He considers the possibilities of where a murderer would hide the weapon before and after the murder and checks all of these places exhaustively.
After a thorough search, he notices that the drainpipe on the rooftop has dried blood on it.
Realizing that this may be the hiding place of the weapon, he carefully retrieves the object and finds that it is indeed the murder weapon.
He is now closer to solving the case and bringing justice to the victim.