Question: Lee Min-ho stared in his first leading film role in 2015 in a film which was set in which part of Seoul? 

Context articles: On the Wrong Track
Lee Min-ho (actor, born 1987)
The Heirs
Parker Sawyers
Jennifer Lopez filmography
Lee Min-ho (actor, born 1993)
Gangnam Blues
Stealing Beauty
Saisakizaka
Blind Date (1987 film)

On the Wrong Track is a 1983 Hong Kong action drama film directed by Clarence Fok and starring Andy Lau, Jeem Yim, Elliot Ngok, Prudence Liew and introducing the then newcomer actress Winnie Chin.
 The film is Lau's third film role and also his first leading film role.
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).
The Heirs (왕관을 쓰려는 자, 그 무게를 견뎌라 – 상속자들 ), also known as The Inheritors, is a South Korean television series starring Lee Min-ho, Park Shin-hye and Kim Woo-bin.
 Written by Kim Eun-sook, the trendy drama is set in a high school populated by the privileged and uber-rich.
 It aired on SBS from October 9 to December 12, 2013 on Wednesdays and Thursdays at 22:00 for 20 episodes.
Parker Sawyers (born 1984) is an American actor.
 His first leading film role was starring as a young Barack Obama in "Southside With You".
 He is also featured in Don't Hang Up (film) as Mr. Lee.
American entertainer Jennifer Lopez has appeared in many motion pictures and television programs.
 She is one of the highest paid actresses in Hollywood and is the highest paid actress of Latin descent, making up to US$15 million per film role.
 She is also the richest actress in Hollywood, with an estimated net worth of $320 million (as of 2014).
 Lopez made her acting debut at age 16 with a small role in the 1986 film "My Little Girl".
 From there, she received her first high-profile job in 1991 as a Fly Girl dancer on the television comedy program "In Living Color".
 Following her departure from the show in 1993, Lopez made several guest appearances in the television series "South Central", appeared in the made-for-television movie "Lost in the Wild" (1993) and starred as Melinda Lopez in the television series "Second Chances" (1993) and its spin-off "Hotel Malibu" (1994).
 "Second Chances" and "Hotel Malibu" ran for only a brief period, receiving negative reviews.
 Lopez's first major film role came in the 1995 motion picture "Money Train", alongside Wesley Snipes and Woody Harrelson.
 The film faced negative reviews and is considered to be a box office bomb.
 Her next two film roles in "Jack" (1996) and "Blood and Wine" (1997) were received similarly; however, critics were divided by the latter.
 Lopez received her first leading role in the Selena biopic of the same name in 1997.
 The film was a commercial and critical success and is often cited by critics as her breakout role.
 Later that year, Lopez starred as Terri Flores in the film "Anaconda", which garnered negative reviews by critics despite being a box office success.
 In 1998, Lopez starred alongside George Clooney in the crime film "Out of Sight" (1998).
 The film met with positive reviews and was a box office success.
 In the same year, she also lent her voice to the animated film "Antz".
Lee Min-ho (Hangul: 이민호 ; Hanja: 李敏豪 ) (born June 28, 1993) is a South Korean actor.
 He is well known for his role as young Yang Myung in "Moon Embracing the Sun" (2012) and Song Mang-boo in "Rooftop Prince" (2012).
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.
Stealing Beauty (French: "Beauté volée" ; Italian: "Io ballo da sola" ) is a 1996 drama film directed by Bernardo Bertolucci and starring Liv Tyler, Joseph Fiennes, Jeremy Irons, Sinéad Cusack, and Rachel Weisz.
 Written by Bertolucci and Susan Minot, the film is about an American teenage girl who travels to a lush Tuscan villa near Siena to stay with family friends of her poet mother, who recently died.
 The film was an international co-production between France, Italy, the United Kingdom, and the United States, and was actress Liv Tyler's first leading film role.
"Saisakizaka" (幸先坂 , "Fortune Hill Road") is the debut single by Japanese actress Yōko Maki, released on May 27, 2013.
 The Ringo Sheena-produced song was used as the theme song to the film "The Ravine of Goodbye" (2013), Maki's first leading film role since "Veronika Decides to Die" in 2005.
Blind Date is a 1987 romantic comedy film, directed by Blake Edwards and starring Bruce Willis, in his first leading film role, and Kim Basinger.
 "Blind Date" earned mostly negative reviews from critics, but was a financial success and opened at number one at the box office.