Dreaming into the Red Mansion

The plot was incomprehensible, especially when Jia Qing was kidnapped by two religious figures pretending to be girls from a brothel. I thought about it for three days and three nights, but I still couldn't figure out what they were doing after all the effort to lurk in the brothel. Kidnap a random ten-year-old kid and discuss math problems with him? For such a ridiculous reason, he kidnapped a wealthy young man and attracted a lot of attention from the whole city. Was it to expose his identity? These two people are doing things in a completely disorganized and chaotic manner and are totally confused! The actions of all characters in a novel should have their own motivations and purposes, otherwise it will trouble readers. Why do you arrange such a plot? What is the logic of their behavior? Your sect is so full and has so much money to spend that it allows you two to kidnap people in a brothel? ? ? ? ?