I Dote on the Obsessive Second Male Lead in the 1970s

[One-on-One Romance] Lin Xiang transmigrates into a period novel as an insignificant side character, becoming the mother of the obsessive male second lead. At the time, he’s still a tiny baby who has just lost his father. Forced into motherhood, Lin Xiang is eventually driven out by her mother-in-law. Life is hard for a widow raising a little one alone. Then the child happens to find a System and gives it to her. With the System, she no longer has to worry about going hungry in this materially deprived era: she can trade her labor for whatever she wants.

The mother and son had been happily getting by, relying on each other, when something suddenly threw their lives into chaos. How did the husband who died young suddenly come back to life?