War Nishino
why I feel, Prince Li is one of those silently inlove with the princess who passed away? He traveled frequently so they might have an encounter but Liyue haven't put it in mind since she was inlove with someone else then she died... I recalled Prince Li told Yue'r that he waited for her for so long... Since he is inlove with her, he sense her soul on the new body... It is just a guess...