(43 years old), the housemistress of Hosu Women's University dormitory. Kim Hye-yoon as Gye Bun-ok (24 years old), a phone operator at Hosu Women's University dormitory, who could not go to college due to financial issues. She was friends with Yeong-ro but became enemies after claiming her to be the cause of the hostage situation. Jung Yoo-jin as Jang Han-na (32 years old), an impulsive, but passionate ANSP agent, who is Gang-mu's junior and fiancée who was left behind six years ago. She allied with Soo-ho after being betrayed by the entire ANSP and her own father. Supporting People around Soo-ho Kim Min-kyu as Joo Gyeok-chan, a North Korean agent, who is prone to violence. He is later killed by Man-dong. Jang In-sub as Lee Eung-cheol, a North Korean agent, who is trusting and friendly towards Soo-ho. He is killed by Man-dong. Heo Nam-joon as Oh Gwang-tae, a university student who likes Seol-hui. Jeon Moo-song as Lim Ji-rok, the Head of United Front Dept., DPRK and Soo-ho's adoptive father, who adopted both Soo-ho and Soo-hui from a coal mine. Jung Ae-ri as Choi Soo-ryeon, the Deputy Director of Ministry of State Security, DPRK. She is later revealed to be Soo-ho's biological mother. People around Yeong-ro Huh Joon-ho as Eun Chang-su, the Director of the ANSP and Yeong-ro's father. He truly cares for Yeong-ro despite their strained relationship. Kim Jung-nan as Hong Ae-ra, a former film actress, Eun Chang-su's wife and Yeong-ro's stepmother, who has a poor relationship with Yeong-ro. People around Cheong-ya Park Sung-woong as Nam Tae-il, He is the Secretary-General of the Aemin Party and former Director of the ANSP. Ariane Desgagnés-Leclerc as Gong Gil-soon, a longtime friend of Kang Cheong-ya posing as ABK Partners fund manager Linda Young. Jung Hye-young as Cho Seong-sim, daughter of a four-star general and Nam Tae-il's wife. People around Yeong-ro, Ms. Pi, and Bun-ok Jung Shin-hye as Ko Hye-ryeong, a fourth-year student in the Department of Vocal Music and Yeong-ro's dormmate. Her birth name was Ko Hye-ja before she legally changed her name. Kim Mi-soo as Yeo Jeong-min, a fourth-year History major student and Yeong-ro's dormmate, who joined the democratic protests against the authoritarian government. Choi Hee-jin as Yoon Seol-hui, a freshman in the Department of Home Management and Yeong-ro's dormmate. She pretends to be a daughter of a rich family when her parents are actually poor. Jung Yi-seo as Shin Gyeong-ja, the