Hazusenai Konyaku Yubiwa

Eliza, a primary-school teacher, meets Leo, a handsome businessman, on vacation. They fall head over heels for each other, and before long, he proposes to her. It’s only then that she tells him she’s already engaged! Four years pass and Eliza has given her full devotion to caring for her primary-school students, when suddenly, there he is—Leo! Time hasn’t made him any less beautiful, and when he says he’s searching for a nanny for his daughter, Eliza knows her experience as a teacher makes her the woman for the job…but she hesitates. She knows she can’t accept. But with cold eyes, Leo makes an offer she can’t refuse…! Source: Harlequin