A man pulls a cart with collapsed cardboard boxes past boutiques in the Sinchon district in Seoul, May 5, 2015. (Photo by Thomas Peter/Reuters)

South Korean men pass by a TV news program showing images published in North Korea's Rodong Sinmun newspaper of North Korea's ballistic missile believed to have been launched from underwater and North Korean leader Kim Jong-un, at Seoul Railway station in Seoul, South Korea, Saturday, May 9, 2015. (Photo by Ahn Young-oon/AP Photo)

A couple walk past an illuminated pagoda as the gate of the Gyeongbokgung Palace is reflected in a gutter in Seoul, May 7, 2015. (Photo by Thomas Peter/Reuters)

Women stand outside an upmarket boutique for its opening in the fashion district of Apgujeong in Seoul, May 7, 2015. (Photo by Thomas Peter/Reuters)

A man in suit smokes in the backyard of a boutique in the fashion district of Apgujeong in Seoul, May 7, 2015. (Photo by Thomas Peter/Reuters)

Women walk down a street in the fashion district of Apgujeong in Seoul, May 7, 2015. (Photo by Thomas Peter/Reuters)

A woman is reflected in a show window displaying a handbag in the fashion district of Apgujeong in Seoul, May 7, 2015. (Photo by Thomas Peter/Reuters)

A woman is reflected in a window in the fashion district of Apgujeong in Seoul, May 7, 2015. (Photo by Thomas Peter/Reuters)

A woman wearing a jacket reading “Don't Speak Loudly” waits at a traffic light in the fashion district of Apgujeong in Seoul, May 7, 2015. (Photo by Thomas Peter/Reuters)

Women wait in line for the opening of an upmarket boutique in the fashion district of Apgujeong in Seoul, May 7, 2015. (Photo by Thomas Peter/Reuters)

A man walks past a wall painting labelled the “Map of Start-up” at the Google Campus start-up space in the Gangnam district of Seoul, May 8, 2015. Google opened on Friday its “Campus” start-up space in Seoul where it will offer work spaces and mentoring for young Asian tech entrepreneurs, representatives of the internet firm said during a presentation. (Photo by Thomas Peter/Reuters)

A woman uses her smartphone outside a club in the trendy nightlife district of Hongdae in Seoul, May 8, 2015. (Photo by Thomas Peter/Reuters)

A woman smokes outside a club in the trendy nightlife district of Hongdae in Seoul, May 8, 2015. (Photo by Thomas Peter/Reuters)

People listen to a street musician in the trendy nightlife district of Hongdae in Seoul, May 8, 2015. (Photo by Thomas Peter/Reuters)

People stand behind a motorbike in the trendy nightlife district of Hongdae in Seoul, May 8, 2015. (Photo by Thomas Peter/Reuters)

People line up to enter a club in the trendy nightlife district of Hongdae in Seoul, May 8, 2015. (Photo by Thomas Peter/Reuters)

South Korean Buddhists parade during the Buddha Era 2559 Lotus Lantern Festival in Seoul, South Korea, May 16, 2015. South Korean Buddhists celebrate Buddha's upcoming birthday on May 25. (Photo by Jeon Heon-Kyun/EPA)

Woman talks on the phone as she stands next to a jewellery shop in the trendy nightlife district of Hongdae in Seoul, May 8, 2015. (Photo by Thomas Peter/Reuters)

Men stand in a boutique in the trendy nightlife district of Hongdae in Seoul, May 9, 2015. (Photo by Thomas Peter/Reuters)

A woman leans over as she sits on a bench in the trendy nightlife district of Hongdae in Seoul, May 9, 2015. (Photo by Thomas Peter/Reuters)

Women sit outside a club in the trendy nightlife district of Hongdae in Seoul, May 9, 2015. (Photo by Thomas Peter/Reuters)

Women walk down a street in the trendy nightlife district of Hongdae in Seoul, May 9, 2015. (Photo by Thomas Peter/Reuters)

Women stand outside a club in the trendy nightlife district of Hongdae in Seoul, May 9, 2015. (Photo by Thomas Peter/Reuters)

Women walks past a club in the trendy nightlife district of Hongdae in Seoul, May 9, 2015. (Photo by Thomas Peter/Reuters)

People sit in a streat restaurant in the trendy nightlife district of Hongdae in Seoul, May 9, 2015. (Photo by Thomas Peter/Reuters)

A man holds an umbrella as he stands on the deck of a tourist boat that passes under jets of water that shoot from the Moonlight Rainbow Fountain running along Banpo Bridge in Seoul, May 10, 2015. (Photo by Thomas Peter/Reuters)

Children play in front of a giant TV screen at the embankment of the Han River in Seoul, May 10, 2015. (Photo by Thomas Peter/Reuters)

A child drives an electric toy car on a walkway connecting sections of the Floating Island, or Some Sevit, in Seoul, May 10, 2015. (Photo by Thomas Peter/Reuters)

Women take pictures as they stand on the roof of a workshop in the industrial district of Mullae in Seoul, May 10, 2015. (Photo by Thomas Peter/Reuters)

A buddhist monk takes photographs during a lotus lantern parade in celebration of the upcoming birthday of Buddha in Seoul, South Korea, May 16, 2015. Buddha's birthday is commemorated on May 25 in South Korea. (Photo by Kim Hong-Ji/Reuters)

South Korean members of Falun Dafa, also known as Falun Gong, perform during a rally to commemorate “World Falun Dafa Day”, which falls on May 13, in Seoul, South Korea, Sunday, May 10, 2015. More than 500 practitioners attending Sunday's rally denounced the Chinese government's alleged policy of harassment and torture of Falun Dafa members in China. (Photo by Ahn Young-oon/AP Photo)

An examiner tests a prospective firefighter's back muscle strength during a firefighter physical ability exam at Jamsil Stadium in Seoul, South Korea, 11 May 2015. (Photo by EPA/Yonhap)

A seafood restaurant employee helps Chinese tourists on Baozen Street in Jeju, South Korea, on Sunday, March 16, 2014. South Korea plans to draw 10 million Chinese visitors a year by 2020, compared with 4.3 million last year, an increase of 53 percent from 2012, according to data from Korea Tourism Organization. (Photo by SeongJoon Cho/Bloomberg)

A woman prays at a Buddhist shrine on a hilltop in Seoul on May 7, 2015. (Photo by Ed Jones/AFP Photo)