I just don't feel comfortable reading those books that use golden fingers to kill the whole world and forcibly reduce the intelligence of the supporting characters. Let's just read the random things for fun. I don't know about rich families, but they are definitely not so mentally retarded. The plot is probably about the heroine having a fun time watching the time-travelling girl dancing around and yelling at her to take everything away from her.
Intention: You can only rely on yourself in life