I don’t have the answers either, but just some speculation:
He doesn’t seem very close to his family, and they don’t seem to have much expectations from him other than staying out of trouble. They do seem to be very rich, maybe old money and his sister is a doctor, and seeing as he spends as much as he wants without limits it doesn’t seem like he is planning to work at all. He’s gifted Dojun with stocks and buildings (back in amnesia chapters) and maybe a credit card without a limit unless that was Doujin’s brother.
But Jaehee is definitely going to be a household husband lol, now that he finished his education he’s locked in to spoil and pamper his Dojun and their dog daughter haha
I wouldn’t be surprised if he just didn’t invite his family at all. They had very little influence with the plot, and I thought the author was going to explore more after the whole bloody golf club thing when Dojun first visited his home, but maybe later decided to keep it wholesome and keep Jaehee’s family drama free after Dojun’s situation was finally cleared up.
His mom did seem to like Dojun as a good influence on her son, but that was also back in middle/high school.
I wish to meet my own Jaehee in this lifetime.
I’m just curious why Jaehee spending so much money and his parents not even asking. Is jaehee working?. The family didn’t also attend the wedding.