Alright, thank you for waiting. Let's see...
I think your summary content wise works fine, I'd mostly change up some things regarding the grammar and presentation of the summary. I would also use the present time in summaries, as using past tense might trick some readers into thinking that something in the story has already happened elsewhere and that they might have missed it.
When Olivia Flynn, a heartbroken 16 years old Swiss, moves to Japan, she comes across a famous patisserie that consoles her.
What Olivia doesn't know is that the patisserie guy consoling her is ACTUALLY her servant, and meeting him sets off a chain of events that turns Olivia's life upside down.
I changed the original summary up a little to make it easier to read