Moon Seong-hyun

Teenage Moon Baek

Na Yi-soo

Ko Pil-seung (teen)

Baek Hyun-woo (teen)

Young Dr. Cheon

Jin Seong-jun (young)

Prince Shimso

Lim Ye Joon (teen)

Seo Yul (teen)

Gong Tae-seong (teen)

Kang-min (teen)

Min Woo-Cheon (teen)

Hong Doo-shik (teenager)

Jang Han Seok [Teen]

Chae Seong-U / Chae Chi-Su