It was shot in both Yang's hometown of Osaka, Japan, and Pyongyang, North Korea.

[1][2] In August 2006, Yang released a book in Japanese under the same title expanding on the themes she explored in the film.

[2] In the 1970s, Yang's father, an ardent communist and leader of the pro-North movement in Japan, sent his three sons from Japan to North Korea under a repatriation campaign sponsored by ethnic activist organisation and de facto North Korean embassy Chongryon.

However, as the economic situation in the North deteriorated, the brothers became increasingly dependent for survival on the care packages sent by their parents.

The film shows Yang's visits to her brothers in Pyongyang, as well as conversations with her father about his ideological views and his regrets over breaking up his family.