Park Sang-min (actor)

Jang Choon-sub

Jung Young-woong

Ji Se-kwang

Jang Tae-ha

Park Moo-yeol

Park Moo-yeol

Lee Sung-mo Kim Soo-hyun as young Sung-mo

Grand Prince Yangnyeong; Sejong's first brother Jung Chan-woo as child Grand Prince Yangnyeong Lee In as teenage Grand Prince Yangnyeong

Park Suk-koo (Jae-ho's best friend)