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JUST LEAVE HIM ALONE AND GO AFTER THE DAD WHO ACTUALLY TOOK OUT THE LOAN!!!!!
And Mr. Yeon.... TAKE BETTER CARE OF THE GUY WHO YOU'RE USING FOR SEX! Buy him a new phone. Make sure his fridge is stocked. Make sure he has weather appropriate clothes. Give him a black card. Pay off the rest of his tuition until he graduates! All this would probably not make a difference to your bank account.
I know Yeomin would try to refuse it, but he might accept it if you sincerely asked him to accept the gifts.