Dustbound Promise

Her father is the Star Emperor of the Ninefold Abyss, her mother is the Divine Tree of Creation, and she is a descendant of the Golden Crow born with a congenital flaw. Carrying a huge bundle of cheat abilities, Dongfang Xingchen descends to the mortal realm to find the missing petal of her Nine Flame Heart.

After turning seventeen, Chu Nuoqian keeps having the same nightmare. In it, as she tries to save the crumbling Shangyan Palace, her half-brother tricks her into marrying the young palace master of Taihua Palace. Her groom, a gentleman in appearance, carves out her heart and tortures her to death, then annexes Shangyan Palace.

When she awakens from the nightmare, a strange young woman is staring at her with burning intensity.

Chu Nuoqian: Who are you?

Dongfang Xingchen: Me? I'm from the heavens. Pay up [just kidding]. Let's make a deal. I'll protect you, and when the time is right, I'll take something from you.

Chu Nuoqian: ...Are you out of your mind?

Later, Chu Nuoqian discovers that this woman really does have power on a par with a god, though she also seems a little dim-witted?

At the Qionghua Banquet:

Chu Nuoqian: Taihua Palace is a branch of the imperial family. They claim to be descendants of the sun, and he's their young palace master. Xingchen, whatever you do, don't say anything careless...

Dongfang Xingchen: Is this the scumbag?

Qin Xuanming: Greetings. I am Qin Xuanming, young palace master of Taihua Palace. May I ask who you are?

Dongfang Xingchen: Hello. I'm your ancestor.

Qin Xuanming: ?

Chu Nuoqian: ...Technically, that's true, but it still feels a little strange.

How did Dongfang Xingchen, who is straight about everything except her sexuality, end up pampering the reserved, marriage-averse young palace master until she married her?

Theme: You never know when fate will bring people together.