So gooood. So many different mediums for this. Donghua, light novel, drama, etc. Have been reading through the fanfiction of it too. So many really good stories and the fan art is all so pretty. If you like this definitely look up the original authors other stories. MXTX has really good novels.
EDIT: I just got the second paperback novel delivered this past Tuesday. I now have two novels of all three published MXTX series! Half way there!
Mo Dao Zu Shi