Late at night, after completing a rescue operation and returning to the precinct, Doo-jin spots Ki-seok conducting suspicious work on a stranded cruise ship, trying to evade the eyes of the police. Sensing something fishy, Doo-jin begins to track his movements. At the center of a series of crimes unfolding along the Han River are Ki-seok, the Gyeongin River Cruise company, and Baek-cheol, a man who was once like family. As the situation escalates, the Han River Police Force becomes entangled in a complex case threatening the safety of the river and its citizens.
