Why did people read romance novels where they had the wrong child? Why did the poor one not want to break up with her fiancé when the child grew up?

The reason why there was a plot where the child was swapped with the other child was that the poor child didn't want to break up with the fiancé because such a plot would usually cause the reader to have emotional resonance and contradictions. It was because such a plot would usually involve family, love, kinship, and other topics, making the reader feel that they had experienced or were experiencing similar contradictions and difficulties, causing emotional resonance. This kind of plot would usually make the reader feel betrayed. If the child was the wrong one, then the child's parents should have been a family with the fiancé's parents, but now they had become strangers. The reader might feel lost and conflicted. In addition, the one who became poor did not want to break up with her fiancé because he or she had already established a certain emotional foundation. The incident of having the wrong child forced him or her to reconsider his or her life and future. This uncertainty and change also made him or her feel uneasy and worried. Therefore, this kind of plot would usually cause the reader to have complex emotional reactions, including anger, loss, despair, sympathy, and so on.