Bereullin

Ryoo shot the film almost 100% on location in Europe. Filming began on April 16, 2012 on a film set in Namyang, south of Seoul, in Gyeonggi Province. After wrapping there, cast and crew relocated to Berlin, Germany and Riga, Latvia in early May 2012, and among the locations were the roof of Berlin's Westin Grand Hotel, in Schoneberg, at the Hackescher Markt, and on Pariser Platz in front of the iconic Brandenburg Gate in full view of the American and French Embassies. The shoot involved a 15-person German crew from Film Base Berlin, but the majority of production elements and talent were Korean, including around 80 crew members who brought their entire equipment. Observing that Ryoo did the recces of the locations with the actors so that they could get used to the settings, Film Base boss Mathias Schwerbock described the director as "very thorough and precise in his preparations. They are fast at shooting and very efficient."

After the shooting at the hotel, numerous police sirens can be heard. However, those sirens are American in style. German police sirens have different sound.

References Lluvia negra (1989)