The 10-episode story follows reclusive novelist Je Moon-jae (Ryu Jun-yeol) as he loses his identity, finances, and life to the doppelganger known as The Rat, then teams with loan shark-turned-investigator No-ja (Sul Kyung-gu) and detective Park Sun-yong (Lee Kyu-hyung) to unravel betrayals, recover memories, and expose a conspiracy of stolen identities. The entire cast consists of Korean actors in roles that align precisely with the domestic setting and source material, featuring zero race or gender swaps of any established characters. Creator and cast statements center on existential questions of selfhood, proof of identity, and updating Korean folklore for modern audiences rather than any activist framing.

The premise and episodes stay locked on identity theft and doppelganger thriller elements with no social justice themes, critiques of traditional norms, or DEI mandates appearing in production or reception. This clean adherence to the original cultural and narrative foundation produces a straightforward entertainment experience free of imposed ideological messaging.