One Transmigrated into a Book, the Other Transmigrated: Together We Cultivate Immortality

[Strong female lead, two female leads, not a GL romance, no CP, sect cultivation]

P.S. I did my best with the cover. The AI art never quite turned out the way I wanted, so this will have to do.

Zhang Yuyun was a key researcher in the country's weapons program. She wanted to invent a special weapon, but had no inspiration, so she picked up a novel to pass the time. One ill-fated female supporting character in the book shared her name. Since she'd read plenty of transmigration stories where people with the same name ended up transmigrating, and she was already an exceptionally quick learner, she went ahead and memorized the entire original novel. Sure, you shouldn't believe in supernatural forces, but what if? Better safe than sorry. And sure enough, after memorizing it all, she left a bad review, went to sleep, and woke up having transmigrated. In the original story, the heroine was a gentle, kind, and delicate girl on the surface, but she was actually ruthless and often used her tears to steal things. Zhang Yuyun had transmigrated right at the beginning of the original body's tragic story. But who could tell her why the original heroine, Lan Xinying, had also been replaced by someone else? And why was she a little girl of only ten?! What was she supposed to do with the plot now? Hadn't she memorized the whole thing for nothing?