I Don't Want to be the Female Lead[dropped]

But did she reincarnate as the villainess?? NO!! As a side character with no name? NO!!! SHE REINCARNATED AS THE FEMALE LEAD! Ah... what a trouble... But since God pitied her, God gave her a golden finger. A System. ***** Follow Calla's journey as she resist the female lead life along with a fat black bird.