Eun Seom's Ago Union and Tagon's Arthdal have the final battle in the Arth Forest.

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?