Secret: Untold Melody

Doh Kyung-soo

as

Yu-jun

Won Jin-ah

as

Jung-a

Shin Ye-eun

as

In-hee

Bae Sung-woo

as

Seung-ho

Ahn Seung-gyun

as

Kyeong-bong

Kang Mal-geum

as

Min-sook

Kang Kyung-hun

as

Yeon-seo

Kim Kyu-seon

as

Professor of W...

Im Sung-jae

as

Go-tae

Kong Hyun-ji

as

Conductor