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.
San Woong and the Saram propose an alliance with the blue-eyed Neanthal, but when things don't go as expected, Tagon takes command of the Great Hunt.
The villagers cast suspicion on Eunseom upon learning that he has dreams. Tanya questions her destiny. Tagon greets his men in an unlikely place.
Upon finding Do Ti, Eunseom devises a plan to rescue the Wahan and is dismayed to learn the significance of Igutu -- and what this means for him.
Eunseom and Do Ti run into a familiar face in Arthdal and make an alarming discovery. San Woong grows suspicious of his son. Tanya stands up for her tribe.
As Tagon's declaration ripples through Arthdal, Eunseom contemplates the significance of what he saw. Moo Baek seeks advice and is given a quest.
Taealha counsels Tagon about the impending meeting with Eunseom. Mi hol tries to persuade Asa Ron to expose the truth. Tanya sees a mystifying vision.
After a chance encounter, Tanya starts to grasp the meaning of the dream. Tagon's plan upsets Taealha. Moo Baek learns something astounding about Eunseom.
Saya has chilling words for Taealha. Tagon strengthens his grip over Arthdal. Tanya receives news of Eunseom and wonders what Saya's dreams might mean.
Tanya proposes an alliance with saya that proves to be useful for them both, Eun Sum refuses to deny who he is, and ominous signs appear in Arthdal.
Tagon visits Tanya and asks about the Wahan. After hearing about Tanya's dreams, Saya decides to tell her his story. Moo Baek comes across something odd.
Ha Rim makes a startling confession to Moo Baek. Chae Eun goes to see Tanya and tells her the truth about Eunseom. Mi Hol offers Taealha a way out.
Tagon becomes enraged when he discovers Mi Hol is behind Tanya's abduction, and the two later meet to discuss her fate. Eunseom orchestrates an escape.
Tanya becomes overwhelmed by Arthdal's reception of her new role, and demands that Taealha and Tagon keep their end of the bargain.
Mi Hol informs Tagon about the finer points of being a king. Saya's appearance bewilders the Wahan. Eunseom receives help from the Neanthal.
Surviving in Arthdal means knowing how to choose the side that holds power. Taealha is attacked, and Tagon silences those who've uncovered his secret.
Tanya tries to uphold the ways of the Wahan but is dismayed to find that they have changed. Tagon's guards make a gruesome discovery.
Eunseom wrestles with a proposition and ponders how he'll find Tanya. Saya plots a strategy for Tagon to be king. Mi Hol gives Taealha a stern warning.
Tanya receives word of the Wahan and meets someone who's seen Eunseom. Saya grows ncreasingly leery of those around him. Tagon gets what he wants.
Eight years has passed since Tagon took the throne as the second coming of Aramun. Eunseom succeeded in uniting the Ago clans as the second coming of Inaishingi and he leads them to the great war against Arthdal. Meanwhile, Saya must prove his worth to succeed Tagon.
The first battle between Arthdal, led by Saya, and the united Ago forces, led by Eunseom, takes place in Hanchoa. Eunseom and the Ago forces gets overwhelmed by Arthdal's military power. Meanwhile, Tagon realizes the elevated status of Tanya as the second coming of Asa Sin and begins to feel threatened by her absolute power.
Arthdal gets shocked at the unexpected situation in the first battle with the Ago Union.
Prince Arok, the son of Tagon and Taealha, is abducted, and the Arthdal Palace is in an uproar.
The last prophecy by Aramun is announced. Eunseom, Tanya, and Saya try to figure out what it means!
Saya tries to take over the Ago Union. With Tagon's orders, Arthdal faces a new crisis.
Eun Seom finds an unexpected breakthrough in despair. Saya's plan envelops Arthdal in fear.
They need to stop Tagon. A brutal night falls on Arthdal. Eun Seom advances close to Arthdal.
The day of Tagon and Eun Seom's battle comes. Tagon faces a shocking truth.
Eun Seom's Ago Union and Tagon's Arthdal have the final battle in the Arth Forest.
Tan Ya who wants to change Arthdal's owner and Tae Al Ha who wants to protect Arthdal fight.
The final battle between the Ago Union and Arthdal has come. Ta Gon prepares for a personal war. Tanya, Tae Al Ha, Sa Ya, and Eun Seom make one final move to protect what's most precious to them. Who will take over Arthdal?
