When Lee Taemin accidently leaves the balcony door open, his roommate's cat decides to go on walk about. The only problem is that Louis is a vindictive, evil and destructive cat with a love of catnip, couches and Key. 

Now Taemin is forced to go on a cat catching mission before it completely destroys the apartment across from him and end up costing Taemin more than just money. 

Thinking he's home free and going to escape without the apartment owner catching the cat in the act, Taemin ends up picking up more than just one hateful cat.