A 707th Special Mission Group soldier and Kim Hyeon-Jun's best friend, with whom he is recruited into NSS. He also develops feelings for Choi Seung Hee, but later betrays Kim Hyeon-Jun during the Hungary mission. He remains involved in the conflict surrounding IRIS before eventually being killed.
Frontline combat specialist and explosives expert. He leads suppression fire and defensive maneuvers during stealth insertions, protecting the team from North Korean patrols and counter-attacks.
Gye Do-shik is the central figure, a gangster assigned to work as a student teacher during the final year of high school. He struggles between criminal obligations, college and financial pressures, and the demands of teaching. His harsh methods gradually lead him to protect Yoo Mi-jung and accept her request to become her older brother.
NIS Chief and Jun's former superior. Leads investigation and allies with Jun against threats.
Loyal gang associate who appears in early mafia family operations.
Ambitious lawyer forced into marriage with a mafia family, navigating underworld politics.
Former mafia enforcer turned construction worker, struggling to leave his criminal past behind.
A weary Silla general striving to quell border rebellions. He rejects the Queen's romantic advances to preserve his relationship with his betrothed, hoping for a peaceful life. His military campaigns and personal loyalties drive much of the political tension.
Ji-seok is a university professor who loves his wife, So-young, but is having an affair with Su-ji, one of his students. Although he cannot give up his new love, the affair is discovered by So-young and becomes the central conflict in their marriage.
Jin Sa-woo is Kim Hyun-jun's close friend and rival from the 707th Special Mission Battalion. After both men join the NSS, he becomes one of its best agents, but separate secret assignments send them along different paths. He also falls in love with Seung-hee, creating a painful conflict between friendship, rivalry, and duty.
A Korean mobster who runs a New York room salon as a money launderer for the Korean mafia. He supervises the venue, handles customers, and is carrying a bag of cash when another car blocks him and he is shot to death. His murder becomes the central case connecting John, Mike, and Lila.
A former North Korean soldier living in Japan, connected to the wartime history of Yang Dal-soo and Son Ji-hye. His nickname, “Sweet Potato,” helps Detective Oh interpret a cryptic clue and find him. He denies killing Yang Dal-soo and asks for his past to remain buried, while a photograph suggests Yang had been using that history to threaten him.
Jung Jun-ho has 34 screen credits in a career dating back to 1997. Their work spans 7 cinematic universes — most prominently Yakuza Ladies Intimidation with 3 titles. Signature works include Iris, My Boss, My Teacher, My Boss, My Hero. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.
Universe traveler — spans 7 universes
Related entry on Wikidata (Q490130), public domain (CC0).
