Arthdal Chronicles depicts the birth of civilization and nations in ancient times. It is a story of mythical heroes, their struggle, unity and love of people living in a virtual land called Arth. The storyline of Arthdal Chronicles is centered around the ancient city of Arthdal, established on Arth. Eunseom relentlessly fights to protect his own tribe and has strong protective instincts. Tagon is very charismatic and most talented, yet overwhelmingly dangerous. Tanya is the successor of Wahan Tribe clan mother, who realizes her destiny to protect her own people against other powerful tribes. Taealha is the most beautiful lady in Arthdal, and has the strongest desire for power.
Tagon becomes enraged when he discovers Mihol is behind Tanya’s abduction, and the two later meet to discuss her fate. Eunseom orchestrates an escape.
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.
Tanya proposes an alliance with Saya that proves to be useful for them both, Eunseom refuses to deny who he is, and ominous signs appear in Arthdal.
Harim makes a startling confession to Mubaek. Chaeeun goes to see Tanya and tells her the truth about Eunseom. Mihol offers Taealha a way out.
Eunseom wrestles with a proposition and ponders how he’ll find Tanya. Saya plots a strategy for Tagon to be king. Mihol gives Taealha a stern warning.
Tanya receives word of the Wahan and meets someone who’s seen Eunseom. Saya grows increasingly leery of those around him. Tagon gets what he wants.
Tagon visits Tanya and asks about the Wahan. After hearing about Tanya's dreams, Saya decides to tell her his story. Mubaek comes across something odd.
Eunseom and Doti run into a familiar face in Arthdal and make an alarming discovery. Sanung grows suspicious of his son. Tanya stands up for her tribe.
Mihol informs Tagon about the finer points of being a king. Saya’s appearance bewilders the Wahan. Eunseom receives help from the Neanthal.
Tanya becomes overwhelmed by Arthdal’s reception of her new role, and demands that Taealha and Tagon keep their end of the bargain.
After a chance encounter, Tanya starts to grasp the meaning of the dream. Tagon’s plan upsets Taealha. Mubaek learns something astounding about Eunseom.
The villagers cast suspicion on Eunseom upon learning that he has dreams. Tanya questions her destiny. Tagon greets his men in an unlikely place.
As Tagon’s declaration ripples through Arthdal, Eunseom contemplates the significance of what he saw. Mubaek seeks advice and is given a quest.
Upon finding Doti, Eunseom devises a plan to rescue the Wahan and is dismayed to learn the significance of Igutu -- and what this means for him.
Taealha counsels Tagon about the impending meeting with Eunseom. Mihol tries to persuade Asa Ron to expose the truth. Tanya sees a mystifying vision.
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.
Sanung 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.