Kim Si-woo

as King Danjong (Young) (1 episode)

as Orphanage Child 2

as Han-do Child (12 episodes)

as Min-guk

as Child Chae Seung-hyuk (4 episodes)

as Jo Geun-seok (16 episodes)

as Lee Gang-hoon (4 Years Old) (2 episodes)

as Advertiser's son (1 episode)

as Dining family son (1 episode)

as Vincenzo Cassano / Park Joo Hyung [Young] (1 episode)

as [Kindergarten boy] (1 episode)

as Si Hu (1 episode)

as Park Seung-won (1 episode)