The Arithmetic of Love

In the not-too-distant future, technology has advanced to the brink of controlling the flow of time. But because of ethical concerns and fear of the unknown, time travel technology is tightly restricted and exists only in classified projects run by a handful of research institutions. However, an unexpected experimental malfunction sends the genius teenager Li Xin back twenty-one years, to the time when his parents were young. His 35-year-old father suddenly loses his job, plunging the whole family into financial crisis. At the same time, his mother, Tong Yan, becomes pregnant with their third child. Their income has plummeted, their expenses have risen, and the chaos of daily life leaves Tong Yan torn, too. Under the pressures of life and their relationship, the couple waver over whether to have the baby. Back in the past, Li Xin watches their daily arguments and their life gradually fall apart, and he faces an equally difficult choice...