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Jung Saebyeok, a detective, witnesses an unbelievable occurrence while arresting the murderer.

Saeha tries to get into the 13th floor, where classified files on the woman are locked away.

Saeha steals the classified files and learns of a terrible incident that took place in 1997.

Eojin grows concerned about Saebyeok and visits her, but tension remains in their relationship.

Saeha anticipates the woman to show up at the Bureau and waits for Manok, armed.

Saebyeok successfully captures Manok but loses him to the Bureau; the Deputy Director himself takes Manok, claiming that a local police department will not be able to respond properly even if the woman appears again to rescue Manok.

Saeha arrives at the Institution of Radio Research in a world where the Grid was not yet installed. However, his emergence sets humanity on a course towards apocalyptic disaster.

Saeha returns to 2021, but time turns back due to an accident; in this world of the past, there are incidents that only Saeha, Saebyeok, and the woman can remember in advance; due to preexisting memories, Saebyeok remembers where Kim Manok is hiding.

When the Deputy Director of the Bureau learns of Saeha's secret, he attempts to use Saeha to capture the woman; Saebyeok learns of a terrifying secret about herself; Manok is being held captive.

The Bureau attempts to lure the woman by using Manok and Saeha as bait; even under heavy surveillance, Manok escapes, and his escape leads to a tragedy; the Deputy Director, fixated on capturing the woman, learns there are others like the woman.