Arifureta Shokugyou de Sekai Saikyou (WN) - Chapter 498

Li Daoyuan accidentally traveled through the world of novels and became the father of the second-generation rich second-generation villain in the early stage of the novel. At this time, his useless son has already provoked the protagonist of the novel’s destiny, and will soon bring the entire family into the ditch. Li Daoyuan wants to change his destiny from the root…

- Description from novelbuddy

Gu Jin crossed into a novel as the supporting character and best friend of the main female lead, Cheng Xin.

Cheng Xin was frequently surrounded by men of status and quality. As Gu Jin was the female lead’s dearest friend, she doesn’t mind settling for the leftover meager soup if the female lead chose to eat the meat. The two sisters believed they’d enjoy this friendship for a lifetime.

But just as she was ready to latch firmly unto Cheng Xin’s golden thigh, she discovered the body she crossed into had memories of future events beyond the novel’s plot, finding out that her marriage would end in utter failure.

The female lead, Cheng Xin who often quarrelled with the male protagonist would head over to Shao Chong for comfort even though Shao Chong was married to Gu Jin. And after several incidences, Gu Jin advised Shao Chong to have a sense of propriety as her spouse but he told her not to think too much about it, claiming that he only maintained a pure friendship with Cheng Xin.

On the day Gu Jin was kidnapped, her good husband stayed by her cousin’s side and accompanied her to the hospital.

When Gu Jin transmigrated into this new world and learned of the truth, she did not wish to waste this new life as a supporting role for her cousin as the previous soul had done. She’d not live a life as a spectator in someone else’s love story. No. She would be the protagonist of her own romance in this new life.

- Description from Novelupdates

The world I reincarnated into was a world that enabled you to use magic after having read a Grimoire.

And the Grimoire’s contents areーー you wouldn’t believe it- it’s 「Manga」.

This world’s people would take around a year to read a single Grimoire (Manga)

While for me, it would not take an hour, as it was「Manga」

Interpreting and understanding all kinds of Grimoires, the 6 year old me who became the World’s Strongest Master Mage, welcomed brides that were also 6 years old, and started living a carefree life……!!

Living as a concubine’s daughter in her previous life, He Danggui got herself and her daughter tortured and killed by her family and Princess Zhou, while her husband, Lord Ning, allowed them to do so for a secret. After reborn as a child, she swore to hold back her kindness to the villains. How did she survive in a family with various secrets and conspiracies? Who would be her final choice? The love of her previous life or a new lover who could offer her a happy and simple life? Sharing the identities of doctor, political counselor and princess, was she able to bring great changes both in Jianghu and the imperial family? With her intelligence and excellent medical skills, would she let them pay for what they did to her or live differently as a new one?