It's a mouse and cat novel, although it may feel a bit ambiguous because of Qing Shui's words. The assistant CP is Xiao Qing from Xiansili.
The background is that after Sky Tower, the bored Yun Tianqing met Zhan Zhao through Bai Yutang, who was also waiting in the ghost world, and was forced to find a way to get Bai Yutang to return to the human world as a ghost to accompany Zhan Zhao in investigating the case...
There will be original female characters, but I don't have any ideas about the four of them, they are solely responsible for promoting the plot. It was supposed to be pure martial arts, but after getting involved with Xian Si, I always felt that I couldn't control myself and ran towards Xian Xia.