In a mythical land called Arth, the inhabitants of the ancient city of Arthdal and its surrounding regions vie for power as they build a new society.

The story takes place at the beginning of the 19th century. Goo Hae-Ryung is a historian who tries to fight gender stereotypes as her work is often looked down on. She meets Prince Yi Rim.

Dae-gil has been skilled with his hands and has shown a strong desire for winning ever since he was a child. He will succeed his uncle and jump into the world of Tazza, risking his life in competition.

Veering off course from his preset path, a track star follows his own pace and heart for the first time after a film translator steps into his life.

Amid a royal and political power struggle, a king entangles with an intriguing woman — whose hidden desire for revenge transforms into unintended love.