Lee Su-ran endured countless hardships alongside her husband to raise their son, Yang Woo-young. But her son and his wife, Heo So-yeon, used the word "boundaries" as an excuse to treat her coldly, and in the end, Su-ran's husband passed away carrying a deep sense of injustice. Given a second chance at life after death, Lee Su-ran resolves to stop simply enduring and living, reclaiming the property that was taken from her and exposing the hidden truth to the world. In the end, Lee Su-ran cuts ties with her unfilial son and donates her wealth to society, showing the true meaning of filial piety.