Daesung Mart develops into the great MS Mart thanks to Myung Sook’s bravery and Dae Sung’s smartness. Although Dae Sung continuously fails the civil service exam and is about to get dumped by A Hee, his love for his mother’s supermarket does not change. He determines to work there as a cashier, but runs into a case that changes his life as an employee of MS Mart.