Do Do Sol Sol La La Sol

Go Ara

Goo Ra-Ra

Lee Jae-wook

Sun Woo-Joon

Kim Ju-hun

Cha Eun-Seok

Shin Eun-soo

Jin Ha-Young

Ye Ji-won

Jin Sook-Kyeong

Lee Soon-jae

Kim Man-Bok

Moon Hee-kyung

Gong Mi-Sook

Seo Yi-sook

Jo Yoon-Sil

Choi Gwang-il

Sunwoo Myung

Jeon Soo-kyung

Im Ja-Kyeong

Kim Ju-yeon

Kim Shi-Ah

Oh Gi-gwang

Lee Seung Gi [Ha Yeong's friend]

Jung Yeon

Mi-ran

Lee Si-woo

Kim Ji-hoon

Lee Ji-hae

Kim So Hyung [Joon's tutor]