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 (his cover), he meets another girl named Hye-in and rescues her when she comes under attack by school bullies. South Korean Intelligence soon discovers Myung-hoon's activities and begins tracking him, all the while as his own government sends a vicious assassin to eliminate him.
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