The son of a North Korean spy decides to follow in his father's footsteps to protect his little sister. After his father's botched espionage mission, North Korean Myung-hoon and his young sister Hye-in are sent to a labor prison camp. In order to save his sister's life, Myung-hoon volunteers to become a spy and infiltrates the South as a teenage defector. While attending high school in the South, he meets another girl named Hye-in, and rescues her when she comes under attack.
Choi Seung-hyun
Han Yeri
Yoon Je-moon
Cho Seong-ha
Kim You-jung
Lee Joo-sil
Jung Ho-bin
Kim Sun-kyung
Kim Min-jae
Park Sung-woong
Kang Han-na
Yoo Jae-myung
Lee Shin-seong
Um Tae-goo
Park Gil-su
Hwang Yeon-hui
Park Kyung-man