The demonic cultivator Shen Yuan who spends his time adopting a bunch of little demons. At first he only takes in one orphan demon kiddo, then he ends up with three, five, then there are ten, then those ten grow old enough that his little cottage doesn't have room for them all. So they do what anyone would do: they cast evil spells on a mansion, make its owners desperate to sell it, and buy it for a bargain.
So now Shen Yuan has a huge house! And ten children. And maybe another five that he eventually adopts. And many more who join along the way. And obviously he needs babysitters to look after them while he works, so he hires nannies. And cooks. And servants. And teachers.
Then suddenly everyone is calling Master Shen, they bow down to him, and treat him as if he were a master of a demonic sect. And Shen Yuan doesn't care about reputation! He gets paid more when they think he's important, he gets more jobs, and that means more money to spoil his children!
What he didn't take into account is, of course, that Emperor Luo Binghe would arrive at his doorstep. Having destroyed all the cultivation sects, why did this arrogant cultivator think he would allow that one existed just because it was demonic? Luo Binghe is furious: his harem doesn't interest him, there isn't a kind Shizun out there for him who doesn't have another weak copy of him, and now this arrogant cultivator takes advantage of his absence to form a sect.
But Luo Binghe is benevolent: since the demonic cultivator did nothing to him, he will give this arrogant master a warning to dissolve his sect, or Luo Binghe will have it burned. If he is smart, the arrogant cultivator will know what to choose.
Except that the arrogant black and green-robed cultivator simply completely denies having a demonic cultivation sect, introduces the more than twenty demon-children under his care as his children, and even invites Luo Binghe to stay if he wants to prove that it is actually his family and not a sect.
And honestly, Luo Binghe has never seen such an effort to pretend that a sect is a family, but he can agree to stay. It will be nice to clear his mind. Even if everyone is calling this arrogant cultivator "Master Shen", this Master Shen is... kind, in a way that Luo Binghe doesn't know. Perhaps he should stay longer than a while. In fact, he's not at all sure that this isn't a cultivation sect. Some detail must be escaping him. He definitely has to stay.