In 15th century Korea, King Sejong, a visionary ruler, and Jang Yeong-sil, a brilliant inventor, form a dangerous bond as they secretly work to advance astronomy and create a unique Korean calendar. Despite the Ming Dynasty's ban on such research, they push the boundaries of knowledge, facing obstacles and betrayal along the way. Their 20-year journey pushes the limits of human ingenuity and friendship, as they daringly pursue a forbidden dream.

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Some movies that have similar genres and were produced around the same time as Forbidden Dream include Boudica: Rise of the Warrior Queen, Sword of Vengeance, Kazantzakis, Akif.