I Transmigrated Into a Book as Cannon Fodder, and Secretly Got Rich in the Era!

[Transmigrate into a period novel, with a personal space, an alternate era, one-on-one romance with mutual purity, watching the fun and eating melon seeds] Bad news! Lu Rongrong transmigrated into a book, and not just one book at that. The good news, however, was that she was merely a background character in all three books, neither a vicious female supporting character nor a love-brained one. But she was a cannon-fodder female supporting character who gave the heroines their golden fingers. Lu Rongrong looked at the golden fingers of the three protagonists. ...They were all hers. These things had originally belonged to her, so why should she give them to someone else? So... Lu Rongrong made all three heroines' personal spaces recognize her as their master, and then the three spaces merged... Lu Rongrong also unexpectedly discovered that although the heroines had lost the golden-finger spaces she had given them, they had gained other golden fingers instead. As she watched the heroines' antics in Qingshan Brigade, she silently hugged her own secret identity even tighter. But... why did this man keep following her? She was determined to secretly become rich, for goodness' sake?!!! A certain someone revealed a refined and elegant smile, his eyes filled with indulgence. "Rongrong, be good. Let's become rich together!" Note: This is an alternate-era novel. Some details are not meant to withstand scrutiny, and there is no logic to it. It is purely a brainless, lighthearted story. If you dislike it, please do not criticize the author. Of course, you may criticize the characters, but if you criticize the characters, you cannot criticize the author, okay? The author's heart is fragile!!! If you dislike it, just drop it without saying anything. The author is merely an ordinary novice, and the writing cannot please everyone. Please take note of these warnings before reading. There are many typos!!!