Actually he didn't stop. He gave her what "she wanted" - except she wanted the opposite of what she said she wanted hahahaha
@bun-bun i think it wasn't just Khae. As Nai said, he was doing it for the family. He did it for Khae, for Thawat, for their baby. For Nok to reconcile with her sister, and for Nok to reconcile with Khae so they can all be one big happy family. Nai would always be in the outside circle but you'll see how much he observes the whole family, including grandma, and just kind of operates at the sidelines to keep everybody intact, while he remains outside and watches them from there. But when Nok finally says that they're family now, he more actively took part and tried to fix things, except it all backfired since this is lakornworld where no good deed goes unpunished.