They thought he was a pushover, but then the Police Commissioner's daughter was retaliated against...

I think the Busan Police might be mistaken about something.
The investigating officer fell into a utopian fantasy, thinking, "He'll endure everything even if he suffers from mental illness." But then, the Police Commissioner's daughter was targeted for retaliation.
"I'll save all the other women and only retaliate against the police officer's daughter."
Do you want to know why? Just look into why your case was fabricated.^^
So, go ahead and fight among yourselves.^^
Are you scared of the Busan organized crime gangs?^^
This person probably constructed the case, right?
Didn't they say that if they make him a mental patient, they'll consider the tables turned and execute it immediately? If it's proven that you pushed too hard and taunted him even after the doctor gave a bad prognosis, they will execute it immediately.