So-young suspects serial killer J is back. Meanwhile, Da-on remains suspicious about Bit-na’s identity.

Efforts to locate the ringleader of the runaway gang places Eun-seok in grave danger. Geun-hee faces a confrontation about her principles.

Eun-seok fixates on one of the accused perpetrators in a brutal sexual assault case. Tae-ju gains insight into her personal history.

Unable to ignore the discovery of an online scammer who is enabling people to end their lives, Joonwoong takes matters into his own hands.