Question: Lee Min-ho stared in his first leading film role in 2015 in a film which was set in which part of Seoul? 
Related documents: [0]  [DOC] Lee Min-ho (, born June 22, 1987) is a South Korean actor and singer. He first gained widespread fame in Korea and parts of Asia with his role as Gu Jun-pyo in "Boys Over Flowers" in 2009. The role won him a Best New Actor award at the 45th Baeksang Arts Awards. He is noted for his leading roles in "City Hunter" (2011), "The Heirs" (2013) and "The Legend of the Blue Sea" (2016). The success of Lee's television dramas throughout Asia established him as a top Hallyu star. Lee starred in his first leading role in film with "Gangnam Blues" (2015), followed by his first China-produced film "Bounty Hunters" (2016). [END] 
[1]  [DOC] Gangnam Blues (; lit. Gangnam 1970) is a 2015 South Korean noir action film written and directed by Yoo Ha, and starring Lee Min-ho and Kim Rae-won. The film is set in the 1970s against the backdrop of the real estate development of Seoul's Gangnam district amidst socio-political turmoil and terrorism. The friendship of two childhood friends is tested as they find themselves entangled in the collusion and battles between political powers and criminal organizations. [END] 
Answer: 
Gangnam district
Gangnam district