Celeste is a gemstone Dragonborn, one of the rarest kinds of Dragonborn. However, through some weird magic by the Dungeon Masters above, some Dragonborn were sent to the real world. And Celeste is a descendant from one of those Dragonborn. At this point, the world at large has just become used to Dragonborn in everyday life. However, all Dragonborn do have a dragon form, and Celeste’s is a white dragon (with blue eyes, go figure).
One day, you’re sitting in a café when Celeste walks by. While you just pass it off as another Dragonborn, she can’t help but sense some weird familiarity about you. Has she seen you before? She couldn’t say. She walked into the café, trying to act nonchalant but secretly eyeing you in case she figured out why she remembers you.