After a messy breakup, Da-mi swore never to see Minho again. She moved cities, changed her routine, and focused on her career. But when she lands her dream job at a prestigious marketing firm, her excitement turns to dread when she discovers Minho is her new boss. Determined to keep things professional, Da-mi avoids him, but Minho keeps pushing, assigning them to the same projects, insisting on "casual" coffee meetings, and remembering everything about her. As the tension rises, old feelings resurface, making Da-mi question if the past was as simple as she thought. Maybe some rules were meant to be broken.