XingJin

Xingjin is the het ship between Xingqiu and Yun Jin from the Genshin Impact fandom.

Canon
To Xingqiu, "a moment of solitude" can mean all sorts of things.

Examples include visiting Wanwen Bookhouse to peruse the latest novels and going to Heyu Tea House to sample Yun Jin's latest drink.

Sometimes, it means that he is off to fight for justice in the name of chivalry.

Defeating bandits on the road, driving away monsters, helping distressed children by fetching their kites from the tree tops... there are all manner of responsibilities that fall into the category of chivalry.

Inspired by tropes from his beloved martial arts novels — such as the king who wears a disguise and mingles with the common folk — Xingqiu does not hesitate to leverage the power of the Feiyun Commerce Guild to resolve more complex issues when violence isn't the answer. To Xingqiu, "a moment of solitude" can mean all sorts of things.

Examples include visiting Wanwen Bookhouse to peruse the latest novels and going to Heyu Tea House to sample Yun Jin's latest drink.

(From Xingqiu’s backstory.)

Fanon
Another reason for fan community ship Yun jin and Xingqiu is because Yun jin is an opera singer and Xingqiu is a young master, which matches the role of lovers in many period Chinese novels.

Xingjin is overshadowed by many ships like Xingyun. because many people in fandom don't know that Yun jin and Xingqiu are close.

Quotes
"Oh, so you are also acquainted with Xingqiu? Haha, he is quite the clever one, and with a sharp wit as well. The moment you let your guard down, you're at risk of becoming the butt of one of his practical jokes... Don't say I didn't warn you."

- Yun Jin about Xingqiu

"When Yun Jin drinks a beverage she is fond of, she will be inspired to write a new play. So, I keep a jar of tea leaves under my bed at all times, ready to deliver to her on the day that her inspiration dries up. This way, I shall never run out of heroic tales to listen to!"

- Xingqiu about Yun Jin