Koo Kyo-hwan as Shin Pa-rang

Lee Sang-hee as Choi Hyun

Cha Soo-yeon as Choi Soo-jin

Jung Young-ki as Hwang Seung-yeol

Jang Seo-kyung as Lee Seul-gi

Woo Ji-hyeon as Kim Jung-bin

Lee Joon-Young as Sung-hoon

Nam Myung-ryeol as Manager Android

Son Min-seok as Section Chief Android

Kim Seung-hoon as Team Leader Android

Lee Young-suk as Shin Pa-rang's father

Yoon Soon-shim as Shin Pa-rang's mother

Lee Jae-hui as Shin Pa-rang's landlady

Kim Hyun as Lee Seul-gi's mother

Kang Jin-ah as Teaching Assistant