Nian Fanghua's words did make Ma Tianlai waver. Actually, it's true; the reason he didn't tell Nian Fanghua in the first place was because Beisitian didn't want too many people to know. He was worried that if his wife knew, it would upset Beisitian and cause trouble.
Now his wife got along well with Beisitian. Women are easier to get along with, and in some matters, she indeed has more convenience than he does. If they could become close with Beisitian, it wouldn't be a bad thing. So if Nian Fanghua knew Beisitian's true abilities, she would better understand how to handle the situation.
"Do you know there's a type of person called the Mystic Doctor?" Ma Tianlai looked at his wife and told her about the Mystic Doctor's special status and powerful abilities in the country.
Nian Fanghua had long suspected that Beisitian was a very capable person. She knew Ma Tianlai well, trusted his judgment, but didn't expect Beisitian's true abilities to far exceed her imagination.
