A.N.Jell:

Jang Geun Suk as Hwang Tae Kyung
Kang Soo Han as young Tae Kyung
Park Shin Hye as Go Mi Nam (Male) / Go Mi Nyu (Female)
Lee Hong Ki as Kang On Yu / Jeremy
Jung Yong Hwa as Kang Shin Woo

Egyéb:

Uee as Yoo He Yi
Bae Geu Rin as Sa Yu Ri (Fan club president)
Kim In Kwon as Ma Hoon Yi (Mi Nam's manager)
Jang Won Young as Mr Kim (photographer, Nara Daily News)
Choi Ran as Choi Mi Ja (Mi Nam & Mi Nyu's aunt)
Kim Sung Ryung as Mo Hwa Ran
Jung Chan as President Ahn
Choi Soo Eun as Wang Kko Di
Tae Hwang as staff
Kim Ho Chang as dancer
Lee Joo Yeon as Before School member (cameo)
Yoo Seung Ho (cameo, ep9)