I recommend "Time With You Is Very Sweet" to you. This book is a romantic, youthful-teen-school novel. In the plot you mentioned earlier, in order to pursue the female protagonist, the male protagonist silently stuffed love letters into her bag, took the initiative to tutor her, and sang love songs in front of her. In the end, the two of them got together. The words "With You" in the title of the book symbolized the good times they had together. The supermarket scene didn't appear, but there are many other warm and sweet plots in this book. I hope you like my recommendation. Muah ~