What's her background?

If she were anyone else, one would definitely decline King Jin's offer in fear and trepidation.

However, Shi Qingluo did not play her usual cards. 

She smiled and said, "Before my master left, he truly wished that the commoners would benefit. Since you have said so, I have a presumptuous request too."

Before coming to the northern border, the emperor had summoned the couple alone.

The emperor said that they could give King Jin some benefits. 

If Shi Qingluo could come up with an idea to improve the lives of the people in the northern border, they could also make it happen through King Jin.

The emperor's mind revolved about his family and his country. 

Those living at the northern border were also his people, so he was happy to see them leading a better life.

When the commoners' lives got better and better, they would definitely be unhappy if King Jin wanted to rebel.