Yeo Euijoon, who works at a convenience store under frequent threats from gangsters, spends his days in fear, but even so he cannot afford to quit his job, after all, the salary is much higher than in other stores. One day, Euijoon, in danger, is saved by the sudden appearance of Beom Gunwoo. Buying the same things every day, the cashier becomes curious about his savior-customer and... Wait, he lives in the apartment next door?!