Song Ci, a 22-year-old female professional kickboxer, is struck by her opponent during a match and transmigrates into the body of a 65-year-old miserly, shameless old woman named Song. She receives system missions requiring her to win over three male leads, all of whom were previously harmed by the original Old Mrs. Song, and accumulate merit points. Once her merit reaches 100%, she can return to her original world. Using the martial arts skills she developed in her previous life, Old Mrs. Song punches a wealthy woman who takes advantage of men, kicks an unscrupulous landlord, and outsmarts a gold-digging woman who cheats on her partner. In the end, she successfully completes her mission and returns to her original world.