- Nam Joo-hyuk (Gu-cheon)
- Roh Yoon-seo (Saeng-gang)
- Cho Seung-woo (The King)
- Park Soo-yeon (The Queen)
- Jang Young-nam ()
- Kwak Dong-yeon ()
The East Palace — S1E4
Episode: Episode 4
Air Date: 2026-07-17
Runtime: 54 min
Overview
Gu-cheon and Saeng-gang attempt to seal the pond spirit for good. Still suspicious about the crown princes' deaths, Gu-cheon returns to Saeng-gang.