가슴의 문을 두드려도

Ryu Sung-rok

Jung-ho

Moon Su-hyung

Min-jeong

Ji Woo

Eun-hee

Jo Ha-seong

Hyung-gook

Lee Seo-won

Jin-kyu

장준휘

Korean teacher

Yoon Kyeong-ho

Homeroom teacher

안민영

Min-jeong's Mother