Transmigrate into a Book in the 1970s: You Say My Amazing Uncle Is My Younger Brother?

[Siblings Transmigrate into a Book (Reborn) + Space + Frail and Beautiful Female Lead + Period Setting + Military Marriage + Terrible In-Laws]

Transmigrate into a book? And siblings transmigrate into a book together?

After her younger brother transmigrates into the book, he becomes her brother-in-law? And her husband treats Ning Shuzhu's younger brother as his rival?

The bad news: Her new body is frail and needs careful recuperation.

The worse news: Her husband's family is a collection of the worst sorts: an irascible mother-in-law, a selfish father-in-law, a spineless younger brother-in-law, a scheming sister-in-law, a foolish younger sister, and an adopted daughter spoiled by her in-laws.

Dragging her frail body along, Ning Shuzhu can't see a future for herself.

But to her surprise, the family's youngest son, Qi Chenjing, a little demon king spoiled by everyone around him, is actually Ning Chenjing, her younger brother who transmigrated into the book with her!

Qi (Ning) Chenjing: I'm my big sister's most loyal