Prince Seonghyeon's return challenges King Seoljong's authority and triggers significant political shifts.
Prince Seonghyeon's schemes directly threaten Prince Kyungsung's safety, status, and royal standing.
Prince Seonghyeon acts as a primary antagonist whose plans endanger the protagonists and their goals.
King Seoljong must confront the political threat posed by his exiled brother's return and schemes.
Prince Seonghyeon's schemes directly target Cha Seon-chaek's safety and her efforts to alter the story.
Explore the full interactive character relationship map of The First Night with the Duke