Chu Muxi is the younger sister of the universally adored heroine of a cultivation novel.
To change the fate her older sister meets in the story, she disguises herself as her sister's double and approaches the male leads. Then she fakes her death and abandons them, before moving on to her next target.
And so she becomes the rumored first love of the Lord of Shifang Manor, the former cultivation partner of the Pavilion Master of Penglai Pavilion, and the junior sister of the young master of Yunshui Mirror...
Later, her secret identity is exposed, and her abandoned exes come looking for her one after another.
Her current partner grips the back of her neck and asks, "Xixi, who do you like best?"
Chu Muxi: ...Actually, she doesn't like any of them.
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Everyone thinks she's a substitute, but no one knows she's actually a player with a string of lovers.
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A mercurial, self-serving heroine who plays the substitute x a possessive, cunning, gentle hero
Note: Both are each other's one and only; one-on-one romance. The hero loves only the heroine from beginning to end.