Sejin, a café manager and barista unlucky in love, leaves daily anonymous messages on the shop’s “Love is…” board. Jimin, a sommelier who prefers wine over coffee, responds under a false name and begins a playful game of misdirection that turns into real attraction. Their flirtation unfolds through duets, comedic identity swaps, and musical numbers themed around caffeine, alcohol, and emotional dependence. The show builds to a confession scene that exposes both characters’ fears and desires, resolving in a romantic but self-aware ending.