Xu Nianai has a bright smile, is the first in the grade in Chinese, but is always stuck in the 20s in math; Lu Jin is a top ten honors student in the class, and is careless in front of his brothers, but he is venomous and protective of her.
They went from tit-for-tat sworn enemies, to him asking bluntly on WeChat "Do you want to have sex", to his brothers calling each other "sister-in-law" after school started.
She always said that she couldn't fight him, but in the moments when she was protected again and again, she willingly gave her whole heart to this boy.
This is a youthful love that started out noisily, but slowly fermented over the years - it turns out that all the tit-for-tat confrontations are all heartbeats that cannot be hidden.
Purpose: to show the process of adolescent boys and girls learning to protect, tolerate and grow themselves in youth love, and to convey the positive energy of youth of "bravely loving and gentle protecting".