I'm so excited to be back in Arthdal, because things are getting exciting! Secret societies, unexpected alliances, and a birth secret threaten to shake up our antihero's plans to rule Arthdal, and for the first time, he's running scared. What chance does he have against an invisible enemy when all he's ever known is the straightforward brutality of war?
EPISODE 10 RECAPAs Saya participates in the secret ceremony, he prays to Aramun Haesulla, an Igutu. Tanya unwittingly hears his thoughts, and she asks if it's true that Aramun Haesulla was an Igutu. Saya stares incredulously as Tanya repeats his thoughts word for word out loud.
At the same time, Moobaek informs Tagon that Asa Sin went to Iark, and that Tanya is her direct descendant. As proof, he shows Tagon the byeoldaya that he found in the Wahans' sacred bundle, and we see that one of the carvings on the disk is the symbol that Mother Choseol told Tanya to look for.
After the ceremony, Tanya is stopped by Chaeeun and Nunbyeol, who were at the ceremony, and they ask why her face isn't painted. Tanya says this is her first time, and Chaeeun smiles and tells her to wear face paint next time because both Asa Sin and the progenitor of the White Mountain Tribe wore face paint. Tanya wonders if her people's Great White Wolf was truly Asa Sin.
Later, Saya tells Tanya that the bloodline was severed two hundred years ago when Asa Sin disappeared, making today's Asa tribe indirect descendants. He says that nobody ever saw Asa Sin again, but she did send an envoy — Aramun Haesulla.
He wonders if she knows that she read his mind when she asks again if Aramun Haesulla was an Igutu. He says he doesn't know, but that what he's been taught saved him, and that the people from the ceremony don't know he's an Igutu.
Tanya realizes that if the Great White Wolf really was Asa Sin, then she's Asa Sin's direct descendant. She asks Saya what would happen if a descendant came to Arthdal, and he says that person would be made High Priest by Tagon.
Tagon summons Tanya and questions her about the Great White Wolf. She tells him that the day Mother Choseol was supposed to tell her everything was the day his people came, and Mother Choseol was killed, so she never received Wahan's sacred bundle.
He draws the mysterious symbol and asks if Tanya knows what it is, and she lies that she's never seen it before. Recalling what Saya said about being made High Priest, she asks Tagon if she can come to him if she remembers anything, and he gives his permission.
When they're alone, Saya asks Tanya what his father talked with her about. She tells him, though she doesn't know why Tagon questioned her. Saya asks why Tagon saved her life and Taealha made her a maid, so she says that it's because the Great White Wolf told her in a dream to protect him.
Still suspicious, Saya says that she wouldn't have planned to kill herself if she were under orders from the Great White Wolf. Tanya just says that that's why she didn't go through with it, and she hears him think, "I saw you in a dream, too." For a moment, Saya reminds Tanya of when Eunseom tried to kiss her, and she jumps to her feet nervously.
Saya says that it felt like Tanya knew him when they first met, and she claims that it's because she saw him in her dream. He asks what kind of person he was in her dream, and she uses her intuition to make educated guesses. We see little Saya growing up alone and isolated, and Tanya says that Saya was someone who wanted to step into the light.
Awed, Saya takes Tanya's hand and brings it to his face. He says that he wants to tell her everything now, and asks with a pleading expression if she'll listen. Tanya wonders if she'll really have the strength to use him to get what she wants.