By Dramabeans
Jo Hyun-tak
Yoo Hyun-mi
16
70 minutes
JTBC
South Korea
Korean
Source: Wikipedia
Joo Gyeok-chan, a North Korean agent, who is prone to violence.
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.
Kang Cheong-A / Kim Eun-Hye (34 years old), a charismatic and skilled surgeon at a university hospital. She is later revealed to be a North Korean spy.
Choi Byung-tae, a military academy cadet who likes Hye-ryeong.
Lee Eung-cheol, a North Korean agent, who is trusting and friendly towards Soo-ho.
Pi Seung-hee (43 years old), the housemistress of Hosu Women's University dormitory.
Lim Soo-hui, Soo-ho's younger sister. (Episode 2, 10)
Choi Mi-hye, a fashion designer and Ahn Gyeong-hui's wife.
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 Man-dong, a facility manager at Hosu Women's University.
Yeo Jeong-min, a fourth-year History major student and Yeong-ro's dormmate, who joined the democratic protests against the authoritarian government.
Oh Deok-shim, a chef at Hosu Women's University.
Choi Soo-ryeon, the Deputy Director of Ministry of State Security, DPRK.
Cho Seong-sim, daughter of a four-star general and Nam Tae-il's wife.
Eun Chang-su, the Director of the ANSP and Yeong-ro's father. He truly cares for Yeong-ro despite their strained relationship.
Han-na
Nam Tae-il, He is the Secretary-General of the Aemin Party and former Director of the ANSP.
Oh Gwang-tae, a friend of Lim Soo-ho and a university student who likes Seol-hui.
Lim Soo-ho (27 years old), formerly named Ri Tae-san, alias Lim Soo-hyeok. He is a North Korean agent with a mission assigned in South Korea. He lives as a graduate student preparing for a master's thesis in the Department of Economics at the University of Berlin. He fell in love with Yeong-ro at first sight.
Eun Yeong-ro (20 years old), a freshman at Hosu Women's University in the English Literature Department and daughter of Eun Chang-su who is the director of the ANSP. She fell in love with Soo-ho at first sight.
Lee Gang-mu (36 years old), the leader of Team One in the Anti-Communist Investigation Bureau, Agency for National Security Planning (ANSP), who seeks to arrest Soo-ho over the death of his colleague. He gets taken hostage by Soo-ho afterward.
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 accusing her to be the cause of the hostage situation.
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.
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.
Shin Gyeong-ja, the president of the Dormitory Student Council who frequently sleep walks.
Eun Yeong-u, Yeong-ro's brother, was forcibly sent into the military by his father after his involvement in the democratic protests was discovered. (Episode 2, 5, 6, 8)
Song Hye-joo, the former housemother of Hosu Women's University dormitory. She was believed to have committed suicide. (Episode 16)