The prehistoric period has been settled, but chaos still exists.
"What's your name?" The young dragon child stroked Qinglong's head covered with emerald green scales. "Cang Qing." The deep tone was faintly depressing. "Then let's play together from now on, okay?" Yi Longzi looked forward to it.
"Oh! That's great! I have friends!"
Qinglong is still young and unruly. As the leader of the four divine beasts, he didn't know that the words he had unintentionally promised to Dragon Child decades ago would actually become his bond, lasting forever and ever.
It is purely fictitious, the author's imagination, and inconsistent with history.