S01E10: Someone Has to Stop the Bad Guys
The bodies discovered in the mountains appear to be more victims of the 1997 serial murder case. Jae-han learns that Soo-hyun became team leader.
Previous Episode 
Season 1
You're Doomed
S1E1 / 22 Jan 2016
We Still Have a Chance
S1E2 / 23 Jan 2016
We Can Prevent the Killings
S1E3 / 29 Jan 2016
We Found the Killer
S1E4 / 30 Jan 2016
Changing the Past Alters the Present
S1E5 / 05 Feb 2016
Catch Him by All Means
S1E6 / 06 Feb 2016
We Must Dig Deeper
S1E7 / 12 Feb 2016
How Are You Alive?
S1E8 / 13 Feb 2016
Hongwon-dong Case
S1E9 / 19 Feb 2016
Someone Has to Stop the Bad Guys
S1E10 / 20 Feb 2016
The One Last Case
S1E11 / 26 Feb 2016
The Case Was Manipulated
S1E12 / 27 Feb 2016
The Real Assailant
S1E13 / 04 Mar 2016
Not Now, but Maybe in the Past
S1E14 / 05 Mar 2016
Is It Really You?
S1E15 / 11 Mar 2016
If You Don't Give Up
S1E16 / 12 Mar 2016
Lee Je-hoon
Park Hae-young
Kim Hye-soo
Cha Soo-hyun
