내 마음의 풍금

Jeon Do-yeon

Yun Hong-yeon

Lee Byung-hun

Kang Soo-ha

Lee Mi-yeon

Yang Eun-Hee

Song Ok-suk

Yun Hong-yeon's Mother

Kim Jae-in

Nan-hee

Seo Hye-rin

Teacher Yu

Lee Dae-yeon

Teacher Jo

Kim Seon-hwa

Bum-soo's mother

Park Kwang-jin

Kim Joo's grandfather

Lee In

Soon-cheol

Lee Young-hoo

Bookstore Owner

Jeon Moo-song

Headmaster