안녕, 형아

박지빈

Jang Hani

배종옥

Mum

박원상

Dad

서대한

Jang Han-byul

최우혁

Wook

전혜진

Hani's teacher

오지혜

Wook's mother

이승훈

Wook's father

손영순

Wook's grandmother

조영관

Park Jun-tae

Lee Hang

Doctor

Choi Jin-ho

Doctor Na Young-soo