Jo Yeong is shocked to meet his alternate self, Jo Eun-seob, who faints upon seeing him. Detective Jung Tae-eul sets ground rules for the two: Eun-seob goes out during the day, and Jo Yeong at night.
Tae-eul continues her homicide investigation while Lee Gon reveals that the traitor Lee Lim is alive and likely hiding in her world. He shares a falsified autopsy report to help her track him. Jo Yeong is shocked to meet his alternate
In the Republic of Korea, Lee Lim continues to replace influential people with their doppelgängers from the Kingdom of Corea to build his power base. Jo Yeong is shocked to meet his alternate