Genshin Impact's Sweet and Hard Free People

"Xiao Xin, do you want a wife?" Ah... this, Xin Hui looked embarrassed, but still smiled, "Yes, yes, I need a wife, whatever makes you happy."
Until he came to his senses. What?! The cute girl with purple twin tails in front of him is my wife?! And the famous Lady Yuheng!
"There's no way around it, we Liyue people value contracts very much." Faced with the girl's outstretched fair hand, Xinhui hesitated, but still took it.
"Traveler from another world, please...please take responsibility and abide by the contract between us," said Gan Yu, the half-immortal beast. A contract? Xin Hui had already lost most of his memories and couldn't recall any connection between him and Gan Yu. *Don't cry, I'll take responsibility.*
Xin Hui looked at Ke Qing and Gan Yu beside him, feeling uneasy. What should he do? Should he go to Yan Fei to ask about the law? He was quite anxious.
...The distant memory of radiance awakens in the dark, colorless place.
The fragmented images flooding Xin Hui's mind served as a warning against interfering with the seemingly peaceful world of Teyvat. What had happened here?
[The plot of this book is a fantasy interlude; readers can apply it to the Teyvat universe as they see fit. Since Keqing's grandfather is deceased in the game, this has been corrected in this text.]