Responses
From my pov he's calling him father in law in a mocking or sarcastic way, he wasn't being serious.
Ml is going through what I call "Richman Syndrome in Yaoi"
He provided housing, food, clothing, education, accessories and good sex, "what do you mean confession isn't this enough "
That's where we're at for now.

Mr Yeon calls yeomin's father father-in-law but never confessed his love to him directly.. what the hell and here yeomin thinks he doesn't have feelings for him
Also I am kind of scared about the consequences when he finds out all the secrets that Yeon is keeping from him.. from the situation it's not too far.. he is getting closer to all the secrets.. how will yeomin react when he finds out about everything??