It is also an old-fashioned time-travel story, similar to many time-travel novels, but the heroine's calmness, indifference or wisdom attracted him of a generation.
The male protagonist also has a strong and fatal attraction, and he is either indifferent or passionate or sinister or suspicious of her or taking advantage of her. The two are suspicious of each other and attracted to each other, as deadly as a poppy.
He is Xuanyuan Ji Xu; she is Baihu.
Maybe you think it's an old-fashioned time-travel novel, but you will have a different experience...