The Lord Prophet, Heri, told the chosen children about the original timeline or the original world plot their world possessed. The children who were only listening to not offend the two elders before them were terrified as they heard more about the original prophecy of the world. Even their own daughter, Haerin, didn't expect this and she wasn't told by her parents about it as well. But for some reason, she remembers something that had happened in the past.
The past where they had to leave the Elves Land after her father was forced to break up with her dad but choose not to. How they had gone hiding in the human city but still got discriminated against due to her mixed bloodline. Even getting bullied in school was a normal occurrence to her. If not for her Uncle Mo and two elder brothers, Hei Anjing and Ye Xiajie found their family being bullied, they wouldn't have left in that annoying city to move in the ancient forest.
