There is a costume TV series with Jason Wu Xuan and Yuan Wah. What's its name?

The TV series you mentioned that meets all the requirements is Ghost Story.

Ghost is a costume drama based on the classic story Nie Xiaogan, directed by Li Huizhu and others, written by Chen Shisan and starring Barbie Hsu, Chen Xiaodong, Jessica Hester Hsuan, Jason Wu and Nie Yuan. Gallen Lo, Deng Cuiwen, Jackie Lui, Huang Weide and other friendly guests appeared.

The drama mainly tells the story of the magical ghosts and gods in the rivers and lakes between the seventh generation fox demon Nie and scholar Ning and the seventh generation lovers.