This is a pair of twins, about twelve or thirteen years old, and exactly at the age when mischief is their game. However, the younger brother who entered later is clearly much more timid than his older brother, and when asked by his elder brother, he doesn't utter a word, just vigorously nods his head.
They are Chen Yingjun's two younger brothers, who take their father Chen's surname—one called Chen Yingsong, and the other Chen Yingfeng. These two little guys are considered a blessing to Chen's elderly father and stepmother—already twelve or thirteen years old, they aren't allowed to engage in slightly unsafe activities, including setting off fireworks.
Elsewhere, other naughty children of their age might be setting off fireworks, but… never mind—there aren't any mischief-making deeds kids of that age in Yan Fei's memory would be scared to do.
Yan Fei, being a guest who leads them to set off the dangerous Earth-Shaking Thunder, wouldn't that be asking for discomfort!
