Copy cat killer (EN-JUNG X READER)

Описание: A girl named Y/N is a quiet and reserved high school student. When she was 10 years old, she developed emotional trauma from constantly hearing her parents fight every night. The shouting, the slammed doors, and the tension in the house made her withdraw from everyone. By the time she entered high school, people described her as mysterious, cold, and hard to read.
One evening, Y/N left the house at 6:00 PM and told no one where she was going. Her older sister Mina noticed something strange. When Y/N returned around 10:00 PM, she immediately went to the sink and started washing her hands over and over again. Mina felt uneasy.
Later that night, the news reported that two people were found dead behind Daejon Restaurant around the same time Y/N had been out.
Panicked and suspicious, Mina reported Y/N to the police.
The case was assigned to Detective Jungwon, a young but sharp investigator known for solving difficult cases. After questioning Y/N and reviewing the timeline, Jungwon had enough suspicion to arrest her as the main suspect in the two murders.
But something about the case didn’t feel right.
During the investigation, Jungwon discovered that there were no fingerprints, no weapon, and no evidence connecting Y/N to the crime scene. Yet Y/N never tried to defend herself. She stayed silent the entire time.
Then Jungwon uncovered something shocking.
The security camera behind the restaurant had been partially damaged, but a small clip remained. In the footage, the victims were arguing with someone… but it wasn’t Y/N.
It was Mina.
Jungwon looked deeper and realized the truth: Mina had been secretly meeting the victims for months because they were blackmailing her over a large amount of money she had stolen from her workplace. That night behind the restaurant, the argument escalated, and Mina panicked.
She committed the murders.
Afterward, she went home and saw Y/N washing her hands because Y/N had actually been working a late shift inside the restaurant kitchen, helping a friend clean up after closing.
Realizing what she had done, Mina quickly reported Y/N to the police first—hoping suspicion would fall on her quiet sister.
When Jungwon confronted Mina with the footage and evidence, she broke down and confessed.
As Y/N was released from custody, Jungwon apologized for arresting her.
But just as she was leaving the station, Jungwon noticed something strange.
Y/N looked back at him and said quietly:
“Thank you for finding the real killer… Detective.”
Then she smiled.
Later that night, Jungwon reviewed the footage again and noticed something chilling.
Before Mina appeared in the video… another shadow was already standing behind the victims.
A shadow that looked exactly like...