Ji-soo

Cheon Sang-hak (teen) (15 episodes)

Young Dok-ja

Self (1 episode)

Ban Joo-yeon adolescente (12 episodes)

Choi Hee-joon

Son Jun-yeong (Eps 2, 3) (2 episodes)

Lee Han-bong

Han Jun-woo (12 episodes)

Kim Yi-joon (1 episode)

Jung Ki-ho (12 episodes)

Hae-su

Ji-ho

Cha Min Hoo [Young] (12 episodes)

Prince Kangnyeong (2 episodes)

Dong-hwan

Young Moon Gang-tae (16 episodes)

Young Shin-jae / Kang Hyun-min (16 episodes)

Kim Ji Hoon (100 episodes)

Cha Hoon [Dal Gun's nephew / "11 Years Old"] (3 episodes)

Kim Soo-hyeon (niño) (1 episode)

Kyung Ho (1 episode)

Lee Young-joon / Lee Sung-hyun (16 episodes)

Heo Im [Young] (16 episodes)