A Female Supporting Character Is the Female Lead’s Spouse!!!

Gu Nianxi is a vicious female supporting character.
As the fake heiress who was switched at birth, her daily mission is to bully Bai Jin, the real heiress and female lead.
She spreads rumors that Bai Jin is an illegitimate daughter, makes her wear her hand-me-down dresses and eat her leftovers, sabotages the projects she takes over, steals her fiancé...

She expects to see humiliation, resentment, and fury on Bai Jin’s face.
But Bai Jin is always unfazed.
She finishes all the food Gu Nianxi leaves behind, carefully stores the clothes she has worn in her wardrobe, and even after thwarting each of her schemes, she knocks on Gu Nianxi’s door and says meekly, with lowered eyes:
“Sister, I’m sorry. It’s my fault for making you angry again.”

Gu Nianxi: “...”
She trembles with rage.

As a vicious female supporting character, Gu Nianxi naturally meets a miserable end.
She is driven out of the family, reduced to a laughingstock, and left with every bone in her hands shattered before ultimately taking her own life.

But when she closes her eyes and opens them again, she discovers that she has been reborn.
This time, she decides to stop fighting and competing, stay far away from the Gu family, and live her own life well.

Yet she soon notices that the way Bai Jin looks at her has become lingering, scorching, and brazen...

Gu Nianxi originally believes that they can coexist peacefully after her rebirth—until she discovers her missing intimate clothing in Bai Jin’s room.

*
Every night, Bai Jin has the same dream.
In it, the corners of Gu Nianxi’s eyes are flushed red as she sobs and pants softly, as though unable to endure any more. Her raven hair fans across Bai Jin’s bed, and the sweat seeping from her body carries Bai Jin’s warmth, its intoxicating fragrance filling the air.

Tormented by these dreams, Bai Jin desperately tries to restrain herself, but to no avail. Both her gaze and her body are ruled by desire, and she cannot stop herself from clinging to Gu Nianxi.

She believes it is merely a temporary affliction of adolescence and that once the passion fades, she will eventually return to normal.
Only when the dream continues and its amorous visions become a warning of death does Bai Jin realize in terrified dismay that this is not an illness of the body, but an obsession rooted in her heart.

She is afraid of losing Gu Nianxi. So even if Gu Nianxi resents and curses her, Bai Jin will keep her tightly locked away, ensuring that she can never quietly disappear somewhere beyond her sight.
...
“Sister.”
Soft sobs mingle with whimpers beside her ear as Bai Jin murmurs, “Why are you crying again?”
She kisses away every tear rolling down Gu Nianxi’s cheeks:
“Mm, you really should blame me... Shall I help Sister eat it all up?”

Everyone says that the Gu family’s second young lady is elegant and distinguished, as gentle as polished jade—the very picture of a refined gentleman.
Only Gu Nianxi knows that she is a madwoman: greedy, wicked, utterly insatiable... and fond of watching her cry.

——
Tips:
　　1. Both of them are reborn, but Bai regains her memories later than Gu;
　　2. The plot is melodramatic, so please proceed with caution if that bothers you.

——

One-Sentence Synopsis: After the vicious female supporting character is forcefully claimed by the female lead

Theme: You are the gift Heaven bestowed upon me.