Less than Evil

A Masked Serial Killer (1x11)

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Tae Seok seems to be trying to hide his sorrow over Hae Jun's death, and his colleagues console him. In the meantime, another murder takes place, and it seems to be done by Jang Hyung Min who is known to have died from a car accident. Tae Seok's team starts to investigate the murder and looks into the killing method to find out if it's the same as Jang Hyung Min's.