After a rough day and a run-in with a missing dog, overworked office worker Umi Seo wakes up to a surreal nightmare: she’s trapped in the body of her boss’s beloved pet. By day, Umi is a dog. By night, she’s back to being human. Forced to live under one roof with the aloof CEO, Chahyeon Baek, the two begin to grow closer in the most unexpected way. But can Umi ever return to her normal life for good? Or will she be stuck living on a leash forever?