Oh! My Emperor

Episode 21 (1x21)

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The spies of the dynasty are poisoned during the wedding celebration, and both the minister and the people are poisoned and fall. Reckless remarks kill the North Dang Party, and King Shin and North Dang Hyuk try to stop it, but it is in vain. Nakbi-bi cures Buk Dang-hyeok with her superpowers, but she runs out and disappears into a star.