Jang Keun-suk. Jang Keun-suk was 20 in Do Re Mi Fa So La Si Do as 'Sin Eun‑gyoo'.
Cha Ye-ryun. Cha Ye-ryun was 22 in Do Re Mi Fa So La Si Do as 'Yoon Jeong‑won'.
Lim Ju-hwan. Lim Ju-hwan was 25 in Do Re Mi Fa So La Si Do as 'Yoon Jae‑kwang'.
Jung Eui-chul. Jung Eui-chul was 22 in Do Re Mi Fa So La Si Do as 'Kang Hee‑won'.
Park Min-ji. Park Min-ji was 18 in Do Re Mi Fa So La Si Do as 'Sin Na‑ri'.
Lee Hyo-choon. Lee Hyo-choon was 58 in Do Re Mi Fa So La Si Do as 'Eun-gyoo's Mother'.
Song Yool-Kyu. Song Yool-Kyu was >> in Do Re Mi Fa So La Si Do as 'Deok-Pal'.
Kim Hye-ok. Kim Hye-ok was 49 in Do Re Mi Fa So La Si Do as 'Jeong-won's Mother'.Kang Keon-hyang. Kang Keon-hyang was >> in Do Re Mi Fa So La Si Do as 'Director, Screenplay'Kim Il-jun. Kim Il-jun was >> in Do Re Mi Fa So La Si Do as 'Lighting Director'Lim Chun-woo. Lim Chun-woo was >> in Do Re Mi Fa So La Si Do as 'Producer'Kim Hyeon-ok. Kim Hyeon-ok was >> in Do Re Mi Fa So La Si Do as 'Production Design'
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