It seems like you're asking about an event from the animated series "Miraculous: Tales of Ladybug & Cat Noir." However, there might be some confusion with the character names. Kieran isn't one of the known characters in the series.
In the series, after defeating Hawk Moth, Ladybug (Marinette) often returns the Miraculous to their respective owners, but the specifics can vary depending on the episode and the story arc. If you have a specific episode or arc in mind, I can provide more detailed information.