Where to Watch Men of the Underworld: Chapter 4 (2016)

The 4th entry in a 6-part series. Searching for more information about the spy within the WRC and needing networks and leverage to do so, Umehara (Ozawa Hitoshi) takes off to South Korea with his loyal second, Han (Yamaguchi Yoshiyuki) in tow. Meanwhile, Director Tamura (Sugata Shun), contacts Inspector Sano (Shinsui Sanshou) with info on Umehara's movements to bring his downfall. And Tadano (Namioka Kazuki) still pursues the truth about the "accident" he survived, and the burgeoning memory of a familiar pair of silhouettes ...