At one point they were allowed to cross what is technically the border to South Korea at a table in a conference room, to visit the country where they were born.
While the point of the trip is not to mock the regime of North Korea, the three comedians are able to act in ways that might quickly have raised suspicion in Western countries, but due to the isolation of the inhabitants, and extremely low or non-existent exposure to Western media, certain themes such as irony and subtle mockery are not seen as offensive.
While it is difficult to judge the truthfulness of the situation, their female guide throughout their journey seems to develop strong affection for the group, acting very sad when they leave, and expressing hope that they will meet again.
During their trip, all of their camera footage has to be delivered to North Korean censoring officials, and is only returned to them after screening.
The title refers to Rote Kapelle, a communist spy unit that operated in Nazi Germany.