[Rekindled romance from the very first chapter / flirty push and pull / stand-in misunderstanding will be resolved / pure, shameless fluff]
The short version:
Five years after they broke up, she meets her ex again, and he turns out to be her client.
She loves him, loves him, loves him; chases him, chases him, chases him, but her client barely gives her the time of day.
She turns around and goes on a blind date. The client grabs her by the waist and kisses her breathless at her front door. "Didn't you say you liked me? Why did you stop chasing me?"
The proper version:
Five years ago, Jiang Xiao was the teachers' model student: well-behaved, smart, capable, and never causing trouble.
Wen Zhouzhou was also a well-behaved student in the teachers' eyes: sweet-looking, no trouble, and good at charming people.
But in the little woods at school, the two of them kissed again and again, losing themselves in each other.
As they gradually explored what love really meant, a photograph slipped out of a book.
Jiang Xiao was amazed by how much the faces resembled each other, but the name on the back belonged to someone else.
Still, as long as she said she loved him, he believed her. In the end, all he got was an apology.
Five years later, they meet again. She clings to him and plays the devoted pursuer, but nobody cares.
Then she goes on a blind date, and a man's voice rings out from the next table: "Sorry, my wife is throwing a tantrum. I hope she hasn't caused you any trouble..."
(Elementary-school-level writing, with flashbacks; few characters, simple relationships, no rivals in love. Written for the love of it.)