The Roundup

Ma Seok-do and Captain Jeon Il-man travel from Korea to Ho Chi Minh City to extradite Yoo Jong-hoon. The mission takes place four years after the Garibong-dong operation. They begin by meeting Koreans living in Vietnam and gathering intel as their investigation starts.

Jong-hoon is interrogated and admits he turned himself in because Lee Jong-du attempted to kill him. His confession redirects the focus to Jong-du's hideout and hints at a darker operator behind the violence. The investigators prepare to push deeper into the Vietnamese underworld.

They reach Jong-du's hideout only to discover Jong-du is dead. The scene reveals that Kang Hae-sang has kidnapped and killed Koreans in exchange for money, with Choi Yong-gi among the victims. This ties Kang to a larger criminal network.

Ma and Il-man dig in a garden and uncover Choi Yong-gi's body. Local police warn Ma and Il-man to halt the investigation, raising the stakes and friction with authorities. The case seems increasingly entangled with powerful interests.

At a Ho Chi Minh City gambling den, they interrogate a Korean thug named Raku who points to mercenaries working for Kang's operation. The clues indicate that Choon-baek, a wealthy businessman, is paying to eliminate Kang's rivals. The pursuit widens beyond Vietnam.

Kang arrives at a house and kills the hired killers, then overpowers Ma as he intervenes. Kang escapes, leaving Ma and Il-man frustrated. The pair are deported back to Korea to continue the pursuit from home.

Back in Korea, Ma and Il-man learn Kang has smuggled himself into the country to meet Choon-baek. They realize the case is far from closed and that the money trail is crossing borders. The investigation resumes on domestic soil.

Ma interrogates Jang I-soo, who is alive and running an export service, and learns about a recently arrived smuggling boat tied to Kang. CCTV footage from Gongping port confirms Kang's arrival and intensifies the hunt. A week-long deadline to catch him is established.

Choon-baek publicly offers a hefty reward to bring Kang alive, prompting Ma to mobilize resources. The authorities set a one-week deadline to close the case, heightening pressure to trap Kang before he can act again. The team tightens the noose around Kang's operations.

Kang arrives at Choi Yong-gi's funeral and abducts Choon-baek, killing his bodyguard in the process. He then calls Choon-baek's wife In-sook and demands money in exchange for Choon-baek's safe release. Tension rises as a high-stakes ransom unfolds.

In-sook enlists Ma's help, while Jang I-soo accompanies them disguised as her driver. Meanwhile, Dong-gyun locates Kang's hideout and rescues Choon-baek, but is stabbed by Kang and the operation stalls. The plan to arrest Kang proceeds despite the violence.

Acting on a tip from Jang I-soo, Ma stops a bus that Kang plans to use for escape and confronts him directly. After a tense confrontation, Ma defeats Kang and has him arrested. The team celebrates solving the case as order returns.