“It occurred to Soo-Ja that if she gave him permission, he'd kiss her right then and there. But she realized that all along, what she really wasn't to have him in the present - how could she, married woman that she was, married man that he was — but to rewrite the past, have him go back in time and create a version that allowed them to kiss. To be able to kiss him did not seem to take much — a step forward, the angling of her face. But, in fact, it required rearranging the molecules of every interaction they had ever had, from the very first day they met.”