Yoochun as Choi Moo Gak
Shin Se kyung as Choi Eun Sul / Oh Cho Rim
Nam Goong Min as Kwon Jae Hee
Yoon Jin Seo as Yum Mi

People around Oh Cho Rim

Jung In Ki as Oh Jae Pyo
Park Jin Joo as Ma Ae Ri (Cho Rim’s friend)

People at Frog Troupe Theatre

Nam Chang Hee as Jo In Bae
Oh Cho Hee as Comedian Uh Woo Ya
Jung Chan Woo as Wang Ja Bang (President of Frog Troupe)

People at Police Station

Lee Won Jong as Kang Hyuk
Choi Tae Joon as Ye Sang Gil (Detective)
Jo Hee Bong as Ki Choong Do (Detective)
Kim Byung Ok as Sa Joon (Subsection chief of investigation)
Choi Jae Hwan as Tak Ji Suk
Jung Hyun Suk as Detective Kim

Others

Song Jong Ho as Doctor Chun Baek Kyung
Kim Ki Chun as Kim Joong In
Shin Soo Ho as Detective
Heo Dong Won