as Crown Prince Lee Yeong: A charismatic and witty prince who grows into a wise monarch.
as Hong Ra-on: An intelligent street performer disguised as a eunuch who harbors deep secrets about her past.
Driven by debt to loan sharks, Ra-on is forced to enter the palace as a eunuch. There, she becomes a close aide to Lee Yeong, who eventually falls in love with her despite her secret identity. The title itself is symbolic: the "clouds" represent the people, while the "moonlight" represents the monarch. Main Cast and Characters
as Kim Yoon-sung: A charming and talented scholar from an influential clan who becomes Lee Yeong's rival for Ra-on's affection.