Sanung y los saram proponen una alianza con los neanthal, el pueblo de ojos azules, pero las cosas no salen como esperaban y Tagon toma las riendas del ataque.

Tras encontrar a un sobreviviente, Eunseom elabora un plan para rescatar a los wahan, pero queda consternado al descubrir qué significa "igutu"... sobre todo para él.

En Arthdal, Eunseom se encuentra con un rostro familiar y, más tarde, descubre algo alarmante. Sanung empieza a sospechar de su hijo. Tanya sale en defensa de su tribu.

El anuncio de Tagon genera un terremoto en Arthdal, y Eunseom se pregunta cuán importante es lo que vio. Mubaek busca consejos y recibe una misión.

Taealha aconseja a Tagon sobre su reunión inminente con Eunseom. Mihol trata de persuadir a Asa Ron para que diga la verdad. Tanya tiene una visión desconcertante.

After a chance encounter, Tanya starts to grasp the meaning of the dream. Tagon’s plan upsets Taealha. Mubaek 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, Eunseom 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. Mubaek comes across something odd.

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.

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.

Tanya becomes overwhelmed by Arthdal’s reception of her new role, and demands that Taealha and Tagon keep their end of the bargain.

Mihol 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. 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.