The book," A Kiss From My childhood sweetheart ", is very much in line with the plot you described! The female lead was called Bei Xiangling. When she was young, she ate the bread crumbs on the corner of the male lead's mouth for the sake of gluttonous bread. Later, she decided to protect him because she felt that Little Qingci was too obedient. Then, the two of them grew up step by step and finally walked towards a happy ending. I hope you will like this novel. If you have any other genre you want to read, you can come back and ask me questions!😘