Visitors to Unhyeon Palace in central Seoul can step into the shoes of 19th-century royal investigators this month, searching for secret clues across moonlit courtyards to solve a fictional mystery involving a stolen royal seal. The Seoul Metropolitan Government will host "Moonlit Secret Mission: Find the Missing Royal Seal" on select evenings from Wednesday to Nov. 29. The interactive program transforms the historic royal residence located in Seoul's central Jongno District into an immersive stage for storytelling, puzzle-solving and traditional Korean arts. The experience is set during the Joseon Dynasty (1392–1910). A sacred royal seal entrusted to the father of King Gojong mysteriously disappears overnight. Participants play secret agents recruited by the father, navigating the palace grounds at dusk to question historical characters, solve riddles and gather evidence. The two-hour program guides small groups through three key areas of the palace complex. The investigation begins at the outer walls, where visitors interview a servant and play a traditional hoop-rolling game to unl