The Bystander's Self-Cultivation in a 1970s Transmigration Novel

Have you ever experienced a transmigration where you blink and suddenly find yourself in a different scene? Lin Yuzhu has. She transmigrated to the 1970s in a daze—No, she transmigrated into a book. She has a system; the female lead is also around, and the supporting female? Also around, but she is neither. She is just a bystander who stumbled in. As a bystander, she watches the big drama every day; she doesn't want other people's dogs, and she doesn't join other people's excitement. She wants to quietly make a fortune, setting a small goal of a few hundred million first, going to college, buying a house, buying a house, and buying another house. She is determined to be a self-sufficient salted fish, able to sit on the sofa and wiggle her feet for the rest of her life~