Responses
The translation was off. He cares for Hwagok and was actually talking about not minding if the grandchildren die. Please read this thread for a better explanation :)
http://www.mangago.zone/home/mangatopic/6142589/
Wait I'm so confused. Can someone explain why Leebin/Yibin said he doesn't care and will just pretend with Hwagok?? Is it wrong translation cos no I can't accept that he doesn't care about Hwa — his own son (╯°Д °)╯╧╧