A nine-year-old blood type report tears apart a nine-year illusion. Xu Zining, female director of the machinery factory, discovers the daughter she raised with her own hands is not biologically hers, while her real flesh and blood is living under someone else's roof, starving and suffering grievances. Without crying or making a fuss, she digs up old accounts, gathers evidence, goes to court, and liquidates the baby-switching case alongside the million-dollar funds lost by the factory. Both girls finally return to her side, and what was owed to her is paid back, piece by piece.