Signal
Season 1, Episode 5: Changing the Past Alters the Present
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Hae-young starts to investigate Jae-han's disappearance. Jae-han's former colleagues get suspicious about seeing Hae-young digging into the past.
All Episodes - Season 1
Episode 1
You're Doomed
Episode 2
We Still Have a Chance
Episode 3
We Can Prevent the Killings
Episode 4
We Found the Killer
Episode 5
Changing the Past Alters the Present
Episode 6
Catch Him by All Means
Episode 7
We Must Dig Deeper
Episode 8
How Are You Alive?
Episode 9
Hongwon Dong Case
Episode 10
Someone Has to Stop the Bad Guys
Episode 11
The One Last Case
Episode 12
The Case Was Manipulated
Episode 13
The Real Assailant
Episode 14
Not Now, But Maybe In The Past
Episode 15
Is It Really You?
Episode 16
If You Don't Give Up