Where Lu Yuwen decides to stay is his own choice; Su Man has no reason to ask him to stay.
She thought quietly for a moment—she had to work during the day, her mother was at the hospital caring for her father, and there was practically no one at home to host Lu Yuwen. Having him stay here seemed far less convenient than a hotel.
That evening, Su Man mentioned this to her mom. On the phone, her mom sighed repeatedly:
"Well, there's nothing we can do; he's here as a tourist, after all. Naturally, he'll stay wherever is convenient. We'll have to find another opportunity to thank him later."
Expressing gratitude requires careful thought. It shouldn't be one-sided; ideally, the gesture should truly resonate with the recipient so the favor feels repaid.
If Lu Yuwen were short on money, the Su Family could give him a direct monetary token of appreciation. But since Lu Yuwen clearly wasn't facing any financial difficulties, they'd have to find another way.