In Episode 7 of Arthdal Chronicles ("Part 2: The Sky Turning Inside Out, Rising Land"), power shifts in Arthdal as Tanya discovers Saya, her twin, and Eunseom barely escapes, revealing his identity to Moo-baek. Tagon cements his power through a, shaky alliance, while Tanya navigates deadly political waters. You can read detailed recaps and reviews on The Review Geek and Dramas with a Side of Kimchi . Arthdal Chronicles – Season 1 Episode 7 Recap & Review