In the small town of Yanqing, there was a wealthy magnate whose family had five children.
The youngest daughter, the fifth child, had been spoiled since childhood. She needed servants to help her get dressed and eat. She was as beautiful as a flower, delicate as a Kunze, yet happened to be a Qianyuan.
There was a small bun shop in town. The shop had a beautiful, capable Kunze, whose father was dead and mother blind. No one ever came to ask for her hand in marriage at her dilapidated home.
Not long after returning to town, the fifth daughter got it into her head to try the buns at the pretty girl's shop. But one smile from the girl stole her heart.
A few tips:
The key point: this is a fictional ancient setting with ABO, but there won't be any specific descriptions of pheromones and such. It's just a personal worldbuilding detail for having babies later on (forgive the author for thinking so far ahead).
1. The fifth daughter isn't great at looking after herself, but she's still smart.
2. A bewildered oddball vs. an obedient girl who occasionally talks back.
3. Love at first sight followed by every trick in the book. Happy ending, 1v1.
Theme: It's truly not easy to stand tall and strong