Kwon Sang-woo

as Kay

Lee Bo-young

as Cream

Lee Beom-soo

as Cha Joo-hwan

Jung Ae-yeun

as Je-na

Lee Han-wi

as President Kim

Jong-hak Choi

as Engineer

Wung-hoe Gu

as Young Kay

Im Cheol-hyung

as Cat Girl's Song-writer

Eun-ran Jo

as Min-cheol's Wife

Myeongsin Kim

as Kay's Birth Mother

Kyeong-seon Kim

as Wedding Manager

Ha-jin Lee

as Japanese Rocker

Nam Gyu-ri

as Cat Girl

Lee Seung-chul

as Singer A

Jung Jun-ho

as President Lim