What he imagines himself doing when he imagines Yohan's children visiting him?
Haneul rests his head on his palm, trying to figure out what he wants to do in the future. After talking to Joseph who, like he thought, had his life planned out, the unsure omega got the man to help him work out his own. And because Haneul has no idea what he would be doing as a couple, having never imagined it to be possible in the first place, Joseph has to omit the image of him telling his children about his job – something he found on the internet and used when figuring out his own. Instead, he used Yohan – his alpha's brother who Haneul is sure will get married or bonded and have children of his own. Because that is easier for him to imagine.
And now, he just needs to know the answer to the question – what will he be doing?