Chacha Yogiwara never asked for anything fancy. She only wanted to study, make her grandfather proud, and live a normal, peaceful school life. But peace ends the moment a new Marketing instructor walks into her classroom the same man she was secretly engaged to since childhood. Conan Steinward. Smart, calm, handsome… and completely off-limits. No one in school knows that Chacha and the new teacher share a secret past and a family promise that ties them together. Now, she has to hide the truth, survive the teasing, and deal with a teacher who loves to make her blush. Because fate might have planned their story long ago but falling in love at school? That was never part of her plan.