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.

Five Dollars eventually becomes free from being a suspect. However, the police now suspect Dae Sung. To clear his name, A Hee, Dae Sung, and Myung Sook investigate everyone in the neighborhood. Currently, although their biggest suspect is Fish, Products also seems to be very busy right after the murders occurred. With every possibility in mind, the supermarket investigation begins.