Kim So-min

as Park Woo-sung's Son

as child patient (12 episodes)

as Choi Han-gi's youngest son (6 episodes)

as Kim Jik-jin's Son (10 episodes)

as Dano child (16 episodes)

as child 1 (16 episodes)

as Choi Hae (50 episodes)

as pening scene child 1 (16 episodes)

as Seo-joon (13 episodes)

as Mi-nyeo, Se-hyeong's son (24 episodes)

as Kid Brushing His Teeth

as grandson (16 episodes)

as kid (12 episodes)

as Yoon-je (8 episodes)