00:00A nine-year-old boy heard that a murder had taken place in a neighbor's home.
00:03He did not keep his distance like a normal child would.
00:05Instead, he approached and observed closely.
00:08Soon he concluded that the direction of the police investigation was wrong.
00:11He narrowed the pool of suspects.
00:12He determined it was a crime committed by someone the victim knew,
00:15and he concluded the killer was currently inside the building.
00:18The captain of the homicide unit thought the boy was talking nonsense.
00:21He ordered the boy's family to take him home immediately.
00:23A female officer nearby said the boy was a brother.
00:26Their family lived in apartment 602 across the way.
00:28Upon hearing this, the captain changed his earlier attitude.
00:31He decided to speak with the boy to learn more.
00:33He asked whether the boy had seen the crime take place,
00:35and thus concluded it was someone the victim knew.
00:38The boy said he'd been playing video games in his room when the incident occurred.
00:41He only heard a scream and didn't see anything.
00:43The captain became even more curious about how the boy had determined it was an acquaintance crime.
00:47The boy said that first, from the time of the crime until now, no one had left the building.
00:52There are surveillance cameras on the first floor.
00:54The windows have security bars.
00:55Second, from the traces of the scene, it appeared the victim had struggled before dying.
00:59The victim ultimately collapsed beside the sofa, a distance from the doorway.
01:03The body showed no signs of being moved.
01:05It was very likely that the victim had voluntarily opened the door for the killer.
01:08This matches the characteristics of a crime committed by an acquaintance.
01:11Moreover, the boy had seen the murder weapon, and it was indeed the victim's fruit knife.
01:15This meant the killer had not prepared the weapon in advance.
01:18This murder was committed on impulse.
01:19Based on the scene, the killer was not motivated by money.
01:22The deputy captain, standing nearby, disagreed with this view.
01:25Because the scene had been ransacked, there were obvious signs that many valuables were missing.
01:29The boy explained this was the killer's deliberate attempt to mislead the police, a deliberately fabricated ruse.
01:34After all, the crime happened around 9 p.m., or earlier.
01:37At that time, most people would still be awake.
01:39A burglar wouldn't carry out a theft at that hour.
01:41Most importantly, the victim was wearing a gold ring.
01:44This was enough to show the killer wasn't motivated by money.
01:46The captain commented that the boy displayed a level of meticulous thinking beyond his years.
01:50The boy explained he was born into a family of homicide detectives and raised in that environment.
01:54In fact, he said he was a hacker who had time traveled from the 21st century.
01:58He claimed he had been the FBI's number one most wanted as a prodigious young criminal.
02:02Because he had committed so many crimes, he was struck by lightning as punishment.
02:05On his deathbed, he secretly vowed to be a good person in his next life.
02:08When he opened his eyes, he had been reincarnated as a 9-year-old boy born into a detective family because of his background.
02:14His extraordinary deductive abilities could be reasonably explained.
02:17No one doubted him.
02:18Then the boy pointed out another error by the police.
02:20The captain had just said the time before the incident, namely before the scream.
02:24This was an inaccurate statement because the scream might not have been made by the victim.
02:28At the time, the boy was playing games and could hear the sound.
02:31The police didn't understand what the boy meant by that.
02:33Three days passed like that with the case still unsolved.
02:36One day, while his sister, who had been up all night, was catching up on sleep,
02:39he secretly opened the case files his sister had brought back.
02:41He discovered that this was actually a very simple case,
02:44but the police were investigating it as if it were a locked room scenario.
02:47At that moment, he noticed a very important testimony.
02:50According to the testimony of a first-floor neighbor,
02:52they heard a scream at approximately 9 p.m.
02:54The boy repeatedly checked other people's statements.
02:56He quickly identified specific suspects.
02:59The next step was to verify his theory.
03:01He hacked into the Water Bureau's network.
03:02Sure enough, it confirmed that his reasoning was correct.
03:05He immediately woke his sister and explained the situation in detail.
03:08After hearing him, his sister called the detectives on the homicide team.
03:11The boy pointed out that the scream the night of the crime
03:13could not have come from inside the 6-floor apartment.
03:16Because if it came from inside the 6-floor apartment,
03:18the first-floor neighbor wouldn't have been able to hear it.
03:20Although the police had conducted tests earlier,
03:22they concluded that a woman's scream can reach 70 decibels,
03:26which would be enough for someone on the first floor to hear.
03:27But they had overlooked a significant detail.
03:30The first-floor neighbor was somewhat hard of hearing compared to the average person.
03:33Because the hearing loss wasn't severe, it was easy to overlook.
03:36But the boy had also warned the police on the night of the incident.
03:38He had been playing games in his bedroom, wearing headphones.
03:41With three doors between him and the source,
03:43he shouldn't have heard the scream.
03:44But he could hear it.
03:45The hard-of-hearing neighbor on the first floor also heard it.
03:48He searched through all the files.
03:49The police did not record this statement of his.
03:51Based on the above,
03:52the boy concluded that the scream could not have come from inside the apartment.
03:55It was more likely from the hallway.
03:57According to the case details,
03:58the victim had fallen inside the apartment.
04:00The subsequent scream could have been staged by the killer.
04:03This raised another question.
04:04Generally, upon hearing a scream,
04:06people above and below would immediately come out to check.
04:09In that situation,
04:10it would be impossible for the killer to escape.
04:12The boy concluded the killer had not fled,
04:14and that the killer was one of the neighbors who arrived at the scene first.
04:17The killer could only have come from the fifth or seventh floor.
04:19If the killer lived on the fourth floor or below,
04:21after hearing the scream,
04:22they would run downward,
04:23and would likely be seen or heard by a neighbor on the fifth floor who had just stepped out.
04:27But none of the statements mentioned such a situation.
04:29This essentially narrowed the killer down to one of the two units on the fifth floor
04:32or one of the two units on the seventh floor.
04:34On the seventh floor,
04:35one unit had been vacant.
04:36The other unit was occupied by an elderly cop.
04:39So the killer was likely from one of the units on the fifth floor.
04:41Two households lived on the fifth floor.
04:43Apartment 502 was a harmonious family of three.
04:46The man in 501 had been single for many years.
04:48Combining this with the statements,
04:49it could be seen that
04:50the first person to arrive at the scene
04:52was the single man from 501.
04:53The single man was also the first to determine
04:56that something had happened to the victim.
04:57The door opened and walked a few steps inside,
05:00and the footprints left behind belonged to the single man.
05:03The boy concluded that the single man was the killer in this case.
05:05This left the deputy captain puzzled.
05:07If it were really as the boy said,
05:09how could an ordinary person who killed on impulse be so calm?
05:12How could he possibly have thought to stage the scene
05:13or even mislead the police?
05:15The boy said the single man was not an ordinary person
05:17because he had killed before and was tied to a prior homicide.
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