Choi Dae-hyun, a mild-mannered former corporate worker disillusioned with his desk job, struggles to manage his family’s neighborhood
convenience store, which is constantly on the brink of financial ruin. Overwhelmed by the exhausting round-the-clock shifts, Dae-hyun decides to hire a part-time night-shift worker to lighten his heavy workload. Enter Jung Saet-byul, a fiercely athletic and street-smart young woman with a formidable reputation as a high school brawler. Saet-byul has harbored a
secret crush on Dae-hyun since a brief, impactful encounter years earlier when he bought her cigarettes and gave her wise advice. Recognizing him instantly, she eagerly applies for the job, determined to turn over a new leaf and win his heart.Initially, Dae-hyun is deeply suspicious of Saet-byul due to her tough exterior, wild friends, and the frequent rumors surrounding her past. However, her exceptional work ethic, business acumen, and fierce loyalty quickly transform the struggling store into a massive community success. Saet-byul fiercely protects the shop and Dae-hyun, single-handedly fending off local troublemakers and boosting sales with her charismatic customer service. As they spend countless late nights together, Dae-hyun’s initial wariness melts into genuine respect and deep affection, though he constantly battles his own internal hesitation regarding their age gap and social boundaries.Complications arise when Dae-hyun’s ambitious and career-driven girlfriend, Yeon-joo, grows increasingly insecure about the undeniable, intimate bond shared between Dae-hyun and his charismatic employee. Yeon-joo attempts to bridge the social divide, but her upper-class family looks down upon Dae-hyun's modest livelihood, creating persistent tension. Meanwhile, Saet-byul faces trials of her own as figures from her troubled past resurface, threatening to derail her hard-earned reputation and her future at the store. Jealousy, professional sabotage, and family expectations threaten to tear the duo apart, forcing Dae-hyun to reevaluate his safe choices in life and confront his true feelings.Ultimately, after Yeon-joo’s relationship with Dae-hyun dissolves due to a lack of trust, and Saet-byul briefly leaves the store to protect Dae-hyun's public image from malicious gossip, Dae-hyun realizes he cannot imagine his life without her. He actively pursues Saet-byul, proving his unwavering devotion. The series culminates in emotional resolution, with Saet-byul achieving her dream of higher education and professional stability while standing proudly by Dae-hyun’s side, as the convenience store finally thrives as a symbol of their enduring partnership, resilience, and hard-won romance.