Choi Geon-woo has harbored a one-sided love for Yoon Bona since childhood. Finding it increasingly difficult to hide his feelings, he decides to confess to Bona before his military enlistment, planning to run away if rejected. Unexpectedly, Bona accepts Geon-woo's feelings.

As the enlistment date approaches, Bona brainstorms an event for Geon-woo. Remembering how he always called her his 'bunny-like girlfriend,' she decides to purchase a 'bunny girl costume.'

However, the moment Bona puts on the outfit, real rabbit ears and a tail sprout! The instruction manual, which she belatedly checks, contains a subtle hint: "Rabbits have strong sexual urges..."