A child gets off the bus and runs out onto the road...who is the person chasing him?

A child who got on a bus on a cold day without any pants on was returned safely to his family thanks to the quick thinking of a quick-thinking police officer.
On the 11th, the Republic of Korea National Police Agency YouTube channel posted a video entitled "A child who ran out onto the road
According to the video, on the 2nd of this month, Cho was on his way home from work after catching a bus at a bus stop in Gangseo-gu, Seoul.
Officer Seung-hee witnessed a strange scene. Officer Cho found a child riding a bus alone in the cold without any pants on. Officer Cho thought the child might have gotten lost.
He called, but the child didn't answer and just kept looking out the window. When the child pressed the button to get off, Officer Cho, worried that he would get wet, handed him his umbrella.
The child got off the bus with Officer Cho's umbrella and immediately ran out onto the road. Cars were speeding on the road, creating a dangerous situation that could have led to a serious accident.
After asking the bus driver for permission, Officer Cho got off the bus and approached the child. He then offered him an umbrella, picked up the child from the road, and called the police at a nearby convenience store.
At this time, Officer Cho found the phone number of the parent from the necklace the child was wearing, so he called the parent and told them the location.
Upon investigation, it was discovered that the child had posted a message two hours earlier saying, "A child with autism spectrum disorder has gone missing."
It was revealed that a missing person report had been filed stating that the child had been taken to a hospital. The police officers who responded to the report all looked after the child. They took off their jumpers and put them over the child until the guardian arrived.
The parents rushed to the scene after receiving Officer Cho's call and were relieved to see their child, and repeatedly expressed their gratitude to the police officers. The child also hugged the police officers and expressed his gratitude.
He reportedly conveyed this.