After Transmigrating into a Book, the Heroine Only Wants to Ship the Couples

[Ancient-era character in the modern day + alternate setting] Zhang Jiajia is a bona fide underachiever who fails every exam. She never expected an accident to transmigrate her into a book she'd read, where she becomes a cannon-fodder character who barely appears. She has neither a golden finger nor any special abilities. Worst of all, the plot has gone so far off the rails that even her own mother wouldn't recognize it. All she can do is sigh at the sky: [People who abandon stories halfway through are just the worst.]

As a modern-day layabout who can't do anything right but somehow beats the top student, Zhang Jiajia gets by on the over-the-top affection of her adoptive father and brothers. That's how she manages to thrive in the Luo household.