Such things are merely a matter of convenience for Su Chen.
But the question is, why?
Why should he act?
What qualifications does the Nishijiu Family have to make him act?
Just because he's a nominal Guest Elder of the Nishijiu Family?
Is that enough?
After all, there really aren't many connections between him and the Nishijiu Family. If there is, it's just the bond of Shuiyue Jingxiang between him and Nishijiu Sharo.
If it's to help Nishijiu Sharo, perhaps due to support and other factors, Su Chen might help Nishijiu Sharo with some things to establish her prestige and get better results.
But for the Nishijiu Family, Su Chen sees no need to show any kind face.
This group of people has the face of a dog.
If you let them think it's easy to take advantage, they'll likely push their luck.
But if you make them understand that it's not easy to take advantage, they might settle down a bit.
