Su Nan corners Lu Jingshen on the balcony. She doesn’t ask for a loan; she asks for a marriage.

As Su Nan reaches for the car door, Lu Jingshen pulls her back, his face inches from hers.

The male lead should be cold to everyone else but intensely protective (and eventually "addicted") to the female lead.

Ensure there is a moment where the heroine, with the hero's backing, gets a win over people who previously looked down on her.

This sounds like the perfect setup for a high-stakes, "overbearing CEO" style web novel or drama script. Addiction to Wife Doting Episode 1: The Contract and the Cold-Blooded CEO

However, Lu Jingshen hands her a black diamond card. “If you’re going to be my wife, stop looking like someone can hurt you. Buy whatever you want. If anyone touches a hair on your head, they answer to me.”