For a little over a year, Hyejeong has been living in the apartment next to Seolhyun, a not-so-neighborly cat owner. She's pretty sure by now that she doesn't like Seolhyun, and that the feeling is mutual. However, Hyejeong suddenly wakes up with the ability to communicate with animals. That same day, she finds herself taking care of an ill Seolhyun, with the latter's cat, Hamilton, by her side - who casually reveals his owner's "intent to mate" with her.