Cast of Once Again

13 credited, in billing order.

Cho Byeong-kyuas Jeon Woo-seok

Han Eun-suas Im Ji-min

Koo Jun-hoeas Noh Bong-gyun

Choi Hui-seungas Park Ji-sung

Park Cheol-minas The Monk

Lee Mi-doas Woo-seok's Mother

Kim Da-hyunas Jeon Woo-seok

Kim Hyung-sukas Lee Seok-min

Kim Nu-rias Hee-won

Kim Kyeolas Woo-seok's Father

Seo Hye-wonas Dong-sook

Han Seo-junas Min-cheol

Kim Jang-wonas Homeroom Teacher