Knocking On The Door of Your Heart

Ryu Sung-rok

as

Jung-ho

Moon Su-hyung

as

Min-jeong

Ji Woo

as

Eun-hee

Jo Ha-seong

as

Hyung-gook

Lee Seo-won

as

Jin-kyu

Jang Jun-whee

as

Korean teacher

Yoon Kyung-ho

as

Homeroom teach...

An Min-young

as

Min-jeong's Mo...