I want to find a novel set in the 1980s. The female protagonist likes a boy since she was young.

She wanted to find a novel set in the 1980s. The female protagonist liked a boy since she was young. She didn't remember when she went to middle school or high school and met a male protagonist. At first, the male protagonist thought that the female protagonist liked the boy because he was very handsome like many girls, so he despised him. However, when he later realized that it wasn't the case, he gave the female protagonist a very expensive school bag in town when she was about to go to college. He said that girls had to carry a good-looking school bag outside the city. The female protagonist and the male protagonist did not get together. Later, the male protagonist went to the army and fell in love with someone much younger than him. He was his sister's friend. That girl got together with the male protagonist because she thought that the soldiers were very handsome. Later, she broke up with the male protagonist because she felt that the male protagonist had no time to accompany her. In the end, the female protagonist went to the place where the male protagonist was a soldier without hesitation and got together with the male protagonist. Does the Almighty know?