Han River Police

While on patrol, Han Dujin spots Go Giseok acting suspiciously and gives chase to find out what is going on.

A ferry runs aground right in the middle of the Han River. Later, Du-jin's team gets suspicious when they discover Baek Chul's barge tethered to the ferry.

Han Dujin pursues Go Giseok and his accomplices after the discovery of gold onboard the river ferry. A falling oxygen tank hits Dujin's head and leaves him unconscious in the river.

Han Dujin and Lee Jungchan investigate several mysterious incidents in the Han River, including that of a murdered captain, and hope that Palmi Island will hold some answers; Hwang Mandae plans to use the river cruise business to smuggle gold.

Go Giseok kidnaps Han Dujin and Baek Chul's nephew, Han Jun; a furious Dujin becomes convinced that Giseok smuggled gold and that Baek Chul is involved; Lee Jungchan learns about the trade between Hwang Mandae and Madam Choi.

Han Dujin uses a GPS tracker to pursue Baek Chul, who has arranged to meet Go Giseok and exchange the remaining gold bars for Han Jun's return. Dujin interrupts the meeting and fights off Giseok's henchmen, so Baek Chul can safely escape with Jun.