As for a million, ten million, or a hundred million—even if Pei Ziyu wanted to give that much to Mei Mengzhen, would she even dare to take it? That's another story.
The key point is, he doesn't actually have that much money anyway; it's all just empty talk.
"Also, you haven't even gotten married yet and you've already handed over all your money. What are you going to do after the wedding? Is the bride expected to pay? Or are we supposed to give you money? If we're giving, that's no problem—it's what parents are supposed to do—but didn't you say before that we wouldn't have to worry about your future? If you give everything away now, isn't it just making us get involved?"
