(Deadpan, quirky, funny genius junior sister × gentle, considerate, taciturn, insecure senior brother; 1v1, both are each other's first, happy ending)
Chu Xingqiao transmigrates and becomes bound to the Demon King System.
The Mill King: "Ascend to immortality, and you can return to your original world and receive a billion-yuan prize."
Chu Xingqiao: "You're the Demon King, and I'm the king of mankind. This is in the bag."
The Mill King: "I am the mill from 'Though ground a thousand times, I remain firm; let the winds blow from east, west, north, or south.'"
Chu Xingqiao: "...This is going to be a rough one."
The Mill King: "We'll talk about that later. If you don't go save someone, you'll be dead."
With the Mill King's help, Chu Xingqiao saves Ye Qijing, the eldest senior brother of Chenxiao Sect, who has lost all his cultivation. Their lives become bound together: if Ye Qijing dies, she dies too. Woe is me!
She takes Ye Qijing back to Chenxiao Sect, becomes the sect leader's disciple and Ye Qijing's junior sister, and begins cultivating. Her cultivation level rises rapidly.
One day,
Ye Qijing: "I'm going down the mountain to investigate a missing persons case."
Chu Xingqiao: "I'm coming too."
She has to keep an eye on Ye Qijing at all times. If he dies out there, she'll suddenly drop dead at some deeply embarrassing moment.
Ye Qijing: "I'm going to set up a formation and exterminate demons."
Chu Xingqiao: "Me too, me too. Wherever you go, Senior Brother, I'm going."
Later,
Chu Xingqiao: "I'm going to find my family. I'm going to get revenge."
Ye Qijing: "Can I come along, Junior Sister? Wherever you go, I'm going."
