The literary story starts after the execution of North Korean overall Jang Sung-taek. An order comes from North Korea, reactivating erstwhile spy Park Hye-rim who's spent decades in South Korea as an ordinary 26, 1 day. She is given the assignment bring and to turn Kim Seonu, within her son. Cool-headed,'' quick-witted genius Seonu is an information analyst on North Korea working for the NIS. His girlfriend Yoon-jin is just actually a tour guide for Chinese tourists who can't speak Chinese, and so they fell in love when Seonu helped her translate. Hye-rim is forced to choose between her child and state, and risks her life to see the choice through.