옥탑방 고양이

정다빈

Nam Jung-eun

김래원

Lee Kyung-min / Kevin Lee

최정윤

Na Hye-ryun

이현우

Yoo Dong-joon

봉태규

Nam Jung-woo, Jung-eun's younger brother

장용

Nam Sang-sik, Jung-eun's father

Zin Tae-hyun

Yong Joon [Kyung Min's college friend]

김자옥

Kim Soon-deok, Jung-eun's mother

김무생

Lee Pil-deuk, Kyung-min's grandfather

강부자

Lee Kyung-hee, Kyung-min's grandmother

김창숙

Hye-ryun's mother

Zin Tae-hyun

Joon-ho, Kyung-min's college friend