- Park Eun-bin (Eun Chae-ni)
- Cha Eun-woo (Lee Woon-jung)
- Choi Dae-hoon (Son Kyung-hoon)
- Im Sung-jae (Kang Ro-bin)
- Son Hyun-joo (Ha Won-do)
- Kim Hae-sook (Kim Jeon-bok)
- Bae Na-ra (Kim Pal-ho)
The WONDERfools — S1E4
Episode: Boon the King Duck vs Wunderkinder
Air Date: 2026-05-15
Runtime: 60 min
Overview
Dr. Ha Won-do returns after 20 years, chasing secrets of the Child of Eternity. Later, the gang faces an attack — still unsure of their powers.