A girl in Gangnam disappears. Detective Kang, Broker Yoon and Prosecutor Min race to solve the case.

Dongwoo returns to Gangnam to find it changed as Gilho faces danger while chasing down the suspect.

The investigation takes a dark turn, leading Seojin to call Dongwoo. Gilho faces unsettling news.

Gilho briefs Seojin and Dongwoo on the case. Together, the three head to the Colosseum.

Jaehee heads over to meet Choi Hakgu to save Yeseo, while Dongwoo and Gilho try to rescue Jaehee.

Seojin climbs the ranks with the help of Hakgu while Dongwoo becomes a chauffer and hunts for Yeseo.

As Gilho seeks revenge for Jaehee, he runs into Dongwoo who is hunting for clues to find Yeseo.

Driven by love, revenge, and justice, each confront the cartel in their own way.