Hong Ye-sool is a talented account executive at an advertising agency who possesses a unique, secret ability: whenever her lips touch someone else's skin, she catches a glimpse of that person's future. Despite her professional success, her personal life is complicated by her prickly and demanding team leader, Cha Min-hoo, whom she has always found insufferable. Everything changes when Ye-sool accidentally kisses Min-hoo's neck and sees a shocking vision of them in bed together, sharing an intimate future. As she struggles to reconcile her perception of her boss with the reality of her vision, the two are forced to navigate their professional tensions while dealing with the sudden, confusing shift in their relationship and the reappearance of Ye-sool's ex-boyfriend.