Addition and Subtraction of Love

In the not-too-distant future, technology has developed to the edge of being able to control the flow of time. However, due to ethics and fear of the unknown, time travel technology is strictly blocked and only exists in top-secret projects of a few scientific research institutions. However, an unexpected experimental failure allowed the genius boy Li Xin to accidentally travel back to 21 years ago, to a time when his parents were still young. The 35-year-old father suddenly lost his job, which plunged the entire family into a financial crisis. At the same time, mother Tong Yan was pregnant with her third child. The sudden drop in income, the increase in expenses, and the miserable life put Tong Yan into a dilemma. Under the pressure of life and emotions, the couple hesitated between whether to have a third child. And Li Xin, who returned to the past, watched their daily quarrels, and his life had gradually been fragmented, and he also faced the same difficult choice...