"I came to seek medical treatment. Madam Ling refused to provide it, so I was curious how your father managed to get her consent to save his life?" The man had offered payment, but it was clear they were not interested.
When Yu Chengde heard this, he was startled. "I'm not sure, but Madam Ling is a very caring person. If you seek medical treatment, you might want to appeal to her emotions."
From what he observed and from his understanding of people, Madam Ling valued sentiments and principles. Otherwise, she wouldn't have returned to help the Yu family after learning they were in trouble. They were fortunate to have encountered such a couple; otherwise, they would have faced annihilation.
After this happened, they could be regarded as having survived a great catastrophe. Even if someone came after the eight trigram mirror in the future, they would not target their Yu family.
Appealing to her emotions?
