Reborn as the Wicked Supporting Female Character in an Old-Fashioned Substitute Romance

In old-fashioned body-double angst novels, there's always a pair of sisters like this:

The older sister is gentle and lovely, hopelessly in love with the male lead, and once risked her life to save him as a child. In the end, she marries him and becomes his substitute. After he abuses her physically and emotionally, she runs away while pregnant. He finally regrets everything, the misunderstanding is cleared up, and they live happily ever after.

The younger sister is arrogant and domineering, pretends to be an innocent sweetheart, and takes her older sister's place as the male lead's beloved. She causes trouble and creates misunderstandings between the leads, who eventually live happily ever after, while the villainess is sent to prison, a sanatorium, or a psychiatric hospital...

Song Yuan transmigrates into an old-fashioned body-double angst novel as the scheming, disposable younger sister.

Song Yuan: ...

I'm out, I'm out. I can't be a disposable villainess.

Faced with the domineering male lead, who tells her she's his one true love, Song Yuan sneers. "You idiot. Who do you think you love? It was Song Ruan who fished you out of the lotus pond."

Faced with the vain, affected mother-in-law who looks down on her daughter-in-law and only wants the villainess to marry her son, Song Yuan speaks bluntly. "Ma'am, your son is the one getting married. Why are you sticking your nose into this? Are you that eager to find your grandson a stepmother?"

Faced with parents who dote on the younger sister and neglect the older one, Song Yuan says sarcastically, "Mom, Dad, anyone who didn't know us would think my sister was our family's maid."

Faced with her older sister, the female lead, who's devoted to the male lead and willing to be his substitute, Song Yuan doesn't hold back. "What's so great about that bastard? Wake up. Your son and money are what matter most. Once you've got money, what kind of young hottie couldn't you find?"

Everyone: ...

She's got a point. We can't even argue.

Faced with the devoted, obsessive second male lead written for the audience to root for, Song Yuan feels a little sorry for him. "Hey, there are plenty of fish in the sea. Why break up a happy couple?"

The male lead: "Yuan Yuan is right. I'll listen to her."

Song Yuan: ...

Why does the way he's looking at me feel kind of off?

Only after she gets pregnant does Song Yuan understand: Damn it, this bastard tricked me into having his baby!

Reader's Guide:

1. The male and female supporting characters fall in love.

2. She'll help the female lead find herself again and stop being a substitute.

Theme: Only by being kind and brave can you truly find happiness.