Reverse Memories

Sheng, a teenager who has lost memories of his past,
returns to his childhood town
to search for what he has ‘lost’.
He meets Yiyao, and it’s love at first sight.
At the Summer Festival,
he shyly confesses,
and she accepts.
But the next day
Yiyao loses all her memories of him.
How did she lose them?
Or is his memory playing tricks on him?

That night, he confesses his love to her. The next day, she loses all her memories of him. How did she lose them or is his memory playing tricks on him?