Employees at a struggling mart embrace their roles as kings, defying the customer-centric norms. The manager strives to revive the store, battling against a ruthless boss determined to ruin it.

"Cheap Cheonlima Mart" tells the story of employees at a falling-behind store where the staff is king, rather than the customer. While the manager tries to revive the mart, they're up against the "human bulldozer" boss that aims to ruin the store.

Pegasus Market, where Moon Seok-goo works as a manager, is in bad shape. Jeong Bok-dong is soon appointed as the new CEO after being demoted within Daema Group. Seok-goo becomes hopeful concerning the market's future, not knowing what Bok-dong's true intentions are: sinking the company in order to take revenge on Daema Group. His plan, however, takes an unexpected turn.