The two Devil Kings are quite sharp; once they're on the train, no way could their parents magically produce dog collars. Threats from their parents went in one ear and out the other. However, since these kids are sharp, they certainly wouldn't behave like those silly kids climbing windows and tables to put themselves in danger. On the contrary, they look down on such kids.
Soon, a woman holding a kid of about the same age sitting opposite them looked at the two little darlings crawling back and forth along the inside of the berth and told Manman: "You've taught your kids really well. How do they know to crawl inside and not on the outside, where they'd fall off?"
Manman's forehead broke out in a cold sweat, and she stared at her two kids in a strange manner.
Who taught them? It seemed like neither she nor her husband did.
