I wonder if he is going to tell him, " So... How do you want the money to be payed? Will...

I wonder if he is going to tell him, " So... How do you want the money to be payed? Will it be cash or should I put it in the back with your name account?"
Because he knows he won't stay if he says what he really wants to say:" don't go. "
Hye sung will probably have his heart broken by the decision Dojin made but because he let go of Bul when he embraced him he will think that Dojin wants him away from his child...because he is a danger to him. He will accept and then leave the house.

Or

Dojin will wait until Hye sung talks about how sorry he feels of almost(?) dropping Bul. But because of how he is he will say that he never wanted to have the baby in the first place and more hurtful things which will cause Dojin to tell him to get the money and get out. Dojin will give up on Hye sung and be a single parent until Hye sung has mature and comes back begging to be in the lives of Dojin and Bul.