Transmigrate into a Book as a Cannon Fodder: Every Time the Plot Controls Me, the Unhinged One Has My Back

Older Partner + Guiding Lover + Steady and Mature + Two Wealthy Families

Looking for something like Mr. Shen Has a Buddha's Mouth and a Snake's Heart. I want the male and female leads to come from top-tier wealthy families. No long-term plotting, and don't make the relationship progress too fast. They shouldn't get together right at the beginning. Those are the four main things I want.