Cast from Do Re Mi Fa So La Si Do

Jang Keun-suk

Sin Eun‑gyoo

Cha Ye-ryun

Yoon Jeong‑won

Lim Ju-hwan

Yoon Jae‑kwang

Jung Eui-chul

Kang Hee‑won

Park Min-ji

Sin Na‑ri

Kim Hak-cheol

Jeong-won's Mother

Lee Hyo-choon

Eun-gyoo's Mother

Song Yool-Kyu

Deok-Pal