Oh! My Emperor

Episode 14 (1x14)

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The Empress Dowager sends Nak Bi-bi and Sa Eon-yeon to Byeok-ryeon, and Nak Bi-bi can't stand her bullying and attacks her. Suddenly, an unprecedented vermin appears in the Yellow Kingdom, and both the people and the court are in great chaos. Nakbibi finds out that the culprit is crayfish and solves the problem by making various dishes.