Transmigrate into a Book: The Daily Life of Doting on My Husband in the 1950s

By accident, she transmigrated into a book and became a cannon-fodder female supporting character in the 1950s. She has barely arrived in the story when she's already facing the prospect of being sent down to the countryside? What? The male and female leads in the original story are actually her fiance and her cousin? Fine! The plot is a little crazy, but for now, she has no choice but to go along with it.