To prove her divine worth and protect Jinyowon’s reputation, Jin Bu-yeon (Naksu) accepts a perilous challenge from Jin Mu : she must retrieve a plaque from Gwisu , a magical prison filled with deadly wraiths.
While Jang Uk is away at the North Fortress, Jin Mu accelerates his plans to seize control of the firebird with the help of the Unanimous Assembly. Themes & Analysis
In the penultimate week of Alchemy of Souls: Light and Shadow (Season 2, Episode 8), the long-awaited revelation of Naksu’s true identity finally reaches a boiling point.
As noted by fans on Reddit , the revelation is bittersweet; while they are finally "reunited," it comes with the knowledge that Bu-yeon’s soul may eventually vanish to make way for the original soul.
This episode serves as the climax for Bu-yeon’s internal journey as she regains her memories of being the assassin Naksu.