Baka to Test to Shoukanjuu‎ - Volume 7.5, Our Song by Yoshii Akihisa

Gu Yanfei was reborn. In her last life, it was only after her death that she realized she was the real daughter in a story about a real and a fake rich daughter. She was supposed to be the daughter of a nobleman, but someone switched her with another child at birth and left her leading a wretched life — a cannon fodder from start to finish. The female lead was the fake rich daughter, but she was also blessed with good fortune and the affection of the Gu family, taking everything that was rightfully Gu Yanfei’s.

In that life, Gu Yanfei lived as she died, with no rhyme or reason. However, after her death, she transmigrated to a cultivators’ realm and became a healer… But after cultivating herself for 200 years, she failed her ascension trials. Then, one of the divine thunderbolts struck her and sent her back to her last life — back to the moment when the identity of the rich daughter was exposed. Upon her return, everyone in the nobleman’s residence was laughing at her for being illiterate and uneducated, a far cry from the fake rich daughter blessed with good looks and a kind heart, who stood above the rest. They just did not know that Gu Yanfei was a fully-leveled character, reincarnated back to this moment!

Every novel has a slag character, the one who decides to abandon the protagonist at his lowest, most helpless point, either because he can’t stand the poor guy’s circumstances or for other reasons. But after the protagonist wins his way in life again, they’re the ones who beg with broken sobs to be taken back.

Still, water once spilled can’t be recovered again.

Yet the unlucky Shen Jiayan has been bound to a Water Recovery* System to do just that.

*water recovery – comes from an idiom that means “spilled water can’t be recovered” (English equivalent: there’s no use crying over spilt milk).

- Description from Novelupdates

Born into the Thornhill family, Eliana should have been dealing with succession planning and heiress training. But instead, she’s dealing with the crocodile tears of her cousin Alexa.As if stealing her Fiancé wasn’t enough, she’s out to pin everything onto Eliana.Trust issues - Eliana.Popularity issues - Eliana.Landslide - Must be Eliana.In an attempt to end her cousin’s jealousy-ridden machinations, Eliana is forced into a relationship with a childhood disaster, Lucian Alder Sinclair, her most tempting nightmare.Lucian Sinclair has always been synonymous with perfection, at least to most people. But to his family, finding someone who could handle his aloofness has been the top priority.Forced to return to his home country at the behest of his grandfather, Lucian fortunately encounters Eliana who’s in need of a ready-made partner.Constantly up at each other's throats, then into each other’s arms, may the lies they’ve told hold up against discerning family members and unrelenting pursuers.

Du Fei was reborn, and in this difficult era of extreme shortage of supplies, he started his wonderful life of opening and hanging…

- Description from novelbuddy