Devastated after her mom's serious accident and grief-stricken because she hasn't become the daughter she wanted to be for her mother, Jia Xiaoling finds herself transported back in time to the year 1981, where she meets her young mother before she was her mom.

In the not so distant future, Theodore, a lonely writer, purchases a newly developed operating system designed to meet the user's every need. To Theodore's surprise, a romantic relationship develops between him and his operating system. This unconventional love story blends science fiction and romance in a sweet tale that explores the nature of love and the ways that technology isolates and connects us all.