Harmony

Yunjin Kim

Hong Jeong-hye

Na Moon-hee

Kim Moon-ok

Kang Ye-won

Kang Yu-mi

Lee Da-hee

Gong Na-yeong

Jang Young-nam

Section Chief Bang

Park Jun-myun

Kang Yeon-sil

Jeong Soo-young

Hwa-ja Ji

Ji Sung-won

Hyeon-ju

Kim Jae-hwa

Kwon Dal-nyeo

Moon Kyung-min

Prison Warden

Lee Tae-kyeong

Newborn Min-wu

Park Ji-yeon

Harmony Choir / Sil Soo-ro

Cha Jin-hyeok

Hyun-wook

Do Yong-gu

School Director

Park Hye-jin

Yu-mi's Mother