"Actually," the siren was set off by Bai Zhi'an.
After seeing Gu Wei go out, Bai Zhi'an immediately contacted some friends in the UK, who helped him find a few desperate criminals.
Bai Zhi'an offered a high price for these desperados to follow him, and he also tracked his own phone signal.
The signal from the phone stalled at the abandoned factory for over a minute.
Without a doubt, Gu Wei was definitely here.
Although he didn't know why those people didn't check Gu Wei's car, perhaps they did, but didn't find his phone since it seemed to have fallen and gotten stuck under the seat, making it hard to find unless looked for carefully.
Even though he had called the police, he still arrived before them with his men and quietly infiltrated the area.
He showed them Su Meixi's photo and instructed them to rescue her if they saw her.
So even though the desperados he found were not skilled killers, with his bluffing bravado, Kun Bu and his associates were still scared off.