Kim Sang-hoon, the director of the Jung_E project. Revealed to be a robot with an AI brain, he shoots Seo-hyun during her escape but is ultimately destroyed by Jung_E when their train car plummets.
Tae-ho is a gangster hired to recover Woo-sung and is connected to Sang-hyun through the money Sang-hyun owes him. He confronts the group while they are traveling to the meeting, forcing Dong-soo to continue alone while Sang-hyun stays behind to negotiate. Later, a gangster is reported dead at the location where Sang-hyun last met him.
He is a man living in the apartment unit below the sisters. Tormented by the same strange and unidentifiable noise, he becomes convinced that the sisters upstairs are responsible and escalates the conflict by threatening to murder them, making him a major source of danger in the story.
An accomplice in the kidnapping who demands access to the actor's money and obtained the truck used in the abduction. He participates in threatening the hostages.
Privileged son of a presidential candidate deeply involved in the drug trafficking network. His corrupt activities trigger investigations and lead to his exploitation by Goo Gwan-hee. After his drug party is exposed and a retaliatory car crash kills his associates, he descends into madness and commits suicide by jumping to his death.
Jin-woo is Jung-ha's son, returning from abroad with his fiancée. His arrival brings their two families into the same house and exposes tensions around Jung-ha's private life, illness, and relationship. His connection to both his mother and fiancée places him within the story's conflict between family expectations and personal truth.
Nishida is among the Japanese prison authorities at Seodaemun Prison. He is involved in efforts to control the inmates through threats, punishment, and incentives for model behavior. His role places him in opposition to Yu Gwan-sun and the other prisoners as they maintain their convictions and resist the authorities’ attempts to silence them.
Ryu Kyung-soo has 31 screen credits in a career dating back to 2013. Signature works include JUNG_E, Tale of the Nine Tailed 1938, Itaewon Class. Explore the interactive character relationship maps on each title page to trace how their roles connect across franchises.
