The background is still the background of the nine major families, but it is a hodgepodge. The author just let himself go and wrote it all at once, and did not want to finish it all, and then edit and publish it after finishing it. It is just random writing.
This is the story of a master walking around with his apprentice, but among this group of people, each has a partner, and of course there is a single dog. Originally, the master took the disciple out, and the disciple knew what he was interested in and didn't show it so obviously. But since the master himself fell in love, everyone else started to show their love, which made the only single man very miserable.
Just write whatever you want, regardless of whether the logic makes sense or whether there is no framework.