Park Ji-hyun as Dan-bi

Choi Si-won as Jung-seok

Sung Dong-il as CEO Hwang

Park Geon-il as O Chung Gil / "Demon King of Night Tales"

Hwang Se-on as Chae Yeong [Dan Bi's friend]

Seol Woo-in as Kang Jeong Hye [Dan Bi's friend]

Park Cheol-min as Han Jang Man [Team leader]

Kim Young-ah as Jin Gyeong [Korea Communications Commission employee]

Lee Ci-El as Ho Ga Ram

Nam Joong-gyu as An Gyeong [Chang Seop's employee]

Lee Jung-hyoung as Ha Neul [Children's literature publishing company senior]

Kwak Ja-hyung as Du Won

Kim Chang-hwan as Hui Cheol

Hwang Hyun-bin as Planning Team Leader

Moon Jin-seung as Jung Hui Min

Choi Jae-hee as

Park Ho-san as Yun Gang Cheol [Dan Bi's father]

Kim Seo-ra as Hye Jin [Dan Bi's mother]

Choi Byung-mo as [Chairman]