Jiyoun Kim Studio collaborated with Milliong on the Cat Fist Project, a cat toy that can be installed in any living space. It is intricately crafted with interwoven leather straps. Using magnets, it is compatible with Milliong's Three Poles Collection products, allowing for easy attachment and detachment. Additionally, it can be used on regular tables or shelves with the included metal plate.

Various materials and weaving techniques were considered, and numerous samples were created to find the right balance of staying securely in place against a cat's playfulness while also being easy to attach and detach. The Cat Fist was released in winter 2023 by Milliong.