Official match:
Yanyu & Wen Chuci
Jiang He&Chu Beici
Shu Ting&Chu Yunhe
The younger ones are basically no more than 10 years old
This is a world where there are only a few children left in all human beings. They have to accept the experiment of the experimenter, which is the ability to become stronger. Only in this way can they survive.
The setting may be confusing, but it's a good article.
Concept: different values