Secretly, Greatly

A group of spies called the 5446 Corps were trained by North Korean elite special forces since their youth, ostensibly towards the lofty goal of unifying Korea. They are ambitiously dispatched to South Korea, where each disguises himself as a fool, an aspiring singer, and a high school student. Passing boring time without receiving any orders from the North, they gradually get used to life as ordinary neighbors in a small town until one day, their mundane lives are turned upside down when a "secret and great" mission is suddenly assigned to them. Due to the events of the Second Battle of Yeonpyeong, South Korea demands the names, location, and rank of 30 North Korean spies active in South Korea, promising financial aid to the North on the condition that Pyongyang turns in their spies. To prevent the elites from falling into enemy hands, the North Korean government orders dozens of active duty spies to take their own lives. Meanwhile, their North Korean army instructor Kim Tae-won crosses the border to eliminate those who refuse to follow.[10][11][12][13][14]

With 498,282 tickets sold on the day of its release, Secretly, Greatly recorded the highest single day opening of all time (by a domestic film) in South Korea, surpassing the record previously held by The Host, which opened with about 450,000 tickets sold in 2006.[27][28][29] Within just 36 hours after its release, the film drew 1,011,025 viewers, becoming the fastest movie to reach the million mark in audience number, in the nation.[30][31] For its second day (which coincided with Korea's Memorial Day holiday), it recorded the largest admissions total for a single day (by a domestic film) with 919,035 viewers.[32] 72 hours after its release, the number of tickets sold for Secretly, Greatly crossed the 2 million border, making it the fastest film to do so.[33] On its fifth day of release, the total ticket sales broke the 3 million mark, as the fastest record of all time.[8][34][35] The film recorded the biggest opening weekend with a total of 3,491,294 viewers, beating Transformers: Dark of the Moon which opened with 3,356,316 viewers in 2011.[36][37] It also became the highest-grossing webtoon-based movie in the nation, surpassing 2010 film Moss with 3,408,144 tickets sold.[38]

On its eighth day of release, the film became the fastest movie to reach the 4 million mark in audience number, tied with The Host, Transformers: Dark of the Moon, The Thieves, and Iron Man 3.[39][40] By the twelfth day, it drew 5 million viewers.[41] In nineteen days, it became the fourth highest-grossing film of 2013 in the nation, behind Miracle in Cell No. 7 (12.32 million), Iron Man 3 (8.99 million), and The Berlin File (7.16 million), garnering over 6.96 million in audience.[42]

The film was released in multiple territories across Asia and North America.

In North America, it was the centerpiece presentation of the 12th New York Asian Film Festival held on 11 July 2013. Following its festival date, it opened in New York City and Los Angeles on 19 July before rolling out to 10-15 US cities throughout the summer. The 2nd Atlanta Korean Film Festival also screened the film along with several other South Korean films. In addition, the 17th Fantasia International Film Festival in Montreal screened the film in mid-July ahead of its 26 July Canadian release date.

In Asia, the film was first screened in Singapore starting on 18 July before opening in Taiwan on 26 July 2013. It then expanded across the region during the season with runs in Japan, Indonesia and Hong Kong, where Kim made his appearance for the local premiere in late July. Deals were also brokered with China and Thailand.[43] The film was also screened at the 17th Puchon International Fantastic Film Festival and won the NH Nonghyup Citizen's Choice Award.[44]

In Europe, the film was included at the Signals: How to Survive program section of the 43rd International Film Festival Rotterdam held from 22 January to 2 February 2014.

• Official website (in Korean)
• Secretly, Greatly at HanCinema
• Secretly, Greatly at the Korean Movie Database
• Secretly, Greatly at IMDb
• Covertness webtoon at Daum (in Korean)