The series depicts the story of the idol group Thunder Boys, consisting of Choi Ho-rang (Lee Shin-young), Shin Tae-ho (Xiumin), Jo Yi-jun (Hyungwon), Eun Yeong-min (Choi Won-myeong), and Yoon Sang-wu (Lee Sae-on), which disbands due to an unexpected accident, and takes over a failing supermarket (Boram Mart). Oh Ye-rim (Choi Jung-woon), an experienced part-timer with extensive experience in supermarkets, helps in leading the group.
