On the school sports field at night, Lin Haoxing opens the pencil case in his hands. Two beautiful fireflies fly out and circle around him. He opens the letter inside.
The letter reads:
Lin Haoxing,
I told you a story once. A girl went to the supermarket to buy art supplies. A boy was buying art supplies too. The girl challenged him to see who could draw better. She lost, but the boy told her she had won. After that, the girl quietly kept an eye on him. When she heard that another girl liked him, she got nervous. When she heard he had gotten into a fight, she worried about him. Then, little by little, the girl realized that she had fallen in love with him. She wanted to confess, but she didn't dare.
Lin Haoxing, do you think the boy could like this girl?
...Written by Zhou Sisi
Would the boy say yes?
The gears of fate begin to turn when Lin Haoxing transfers to a new school. An art competition brings him and Zhou Sisi together through their shared love of drawing, and the first stirrings of youthful romance bloom freely on campus. But behind the sweetness, trouble and misunderstandings pile up. Zhou Sisi suddenly leaves, and one friend after another drops out, plunging Lin Haoxing into endless grief. After that, he shuts himself away in his studio, using his art to numb the pain. Years later, a celebrated Lin Haoxing returns to the place he once knew. A cafe called Fireflies in the Pencil Case catches his eye. It holds the private code of their memories and a promise of love. Can he unlock the past buried away for so long and continue the romance they left unfinished?