Overview: Cha Yeon-ho finds out that Kim Hyun-min (Kim Dae-ho), the National Forensic Service analyst is the culprit behind the threatening envelopes. Pyo Jung-wook seeks the help of former gangster Yang Seok-chang (Lee Yoo-joon), Chairman of YSC Group. Han Kyung-soo confesses who the actual culprits were in Yeon-ho's vehicular homicide case.