Daesung Mart develops into the MS Mart thanks to Myung Sook's bravery and Dae Sung's smartness. Although Dae Sung continuously fails the civil service exam, his love for his mother's supermarket does not change.
The police begin investigating the body that Dae Sung and Nunchucks Grandpa found. However, Dae Sung becomes nosy again and starts digging into this by himself. His way of investigation is looking into the shopping list of the victim.
People now know that Nunchucks Grandpa is the notorious five-dollar bill counterfeiter. Although some evidence shows that Five Dollars is the murderer, it is not enough to prove his guilt.
Five Dollars eventually becomes free from being a suspect. However, the police now suspect Dae Sung. With every possibility in mind, the supermarket investigation begins.
Five Dollars finds and takes what Yul hid in her secret place. But the chairwoman finds the two and saves Yul from the criminal. Many people now think Five Dollars is not the killer, new suspicions lead to someone within the supermarket.
The chairwoman miraculously survives the fall. Although she is in horrible shape and in a coma, she provides a clue to Products. New events occur and bring up new information regarding the murder cases.
As Products has been acting suspiciously, Dae Sung and Myung Sook tail her to see if she is the killer. However, Products is not the only suspicious one.
Yul comes up with a clever idea to give a clue to Dae Sung. Without any help from the police force, the employees of MS Mart rush over to save Yul. The hostage situation is dangerous, but everyone risks their lives for her.
