Genshin Impact: Reincarnated as Brother Hutao

Jiu Yue, a high school student from the 21st century, accidentally traveled to the continent of Teyvat and was picked up by Grandpa Hutao and brought home. He thought that life would pass by in an ordinary way, but he gradually discovered that there seemed to be some ulterior secret hidden in his body. (This book is a combination of swordsmanship and sweetness, with multiple female protagonists, one female protagonist and one walnut, no system, female protagonist, one protagonist and multiple supporting roles) (There will only be one time traveler in the later stage, please feel free to eat)