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- Movie: Secretly Greatly (English title) / Covertness (literal title)
- Revised romanization: Eunmilhage Widaehage
- Hangul: 은밀하게 위대하게
- Director: Jang Cheol-Soo
- Writer: Hun (comic), Kim Bang-Hyun, Yoon Hong-Gi
- Producer: Kim Young-Min
- Cinematographer: Choi Sang-Ho
- Release Date: June 5, 2013
- Runtime: 124 min.
- Genre: Action / Comedy / North Korea
- Distributor: Showbox/Mediaplex
- Language: Korean
- Country: South Korea
Won Ryu-Hwan (Kim Soo-Hyun) trained in the North Korean Special Forces. He can speak five languages and is also a lethal killing machine. Two years ago, he received orders to deploy to South Korea as a spy.
While wondering in a poor neighborhood in Seoul, Won Ryu-Hwan passed out and was awakened by a worried old mother. The woman then allowed him to live in a small apartment above her modest convenient store and let him work in her store. His identity in South Korea is now Bang Dong-Gu and he has taken up the persona of a goofy, mentally challenged young man. Since that time, Bang Dong-Gu has gotten to know everybody in the neighborhood and has become attached to the woman who treats him like her second son.
One evening, Bang Dong-Gu receives a visitor in his small apartment. His visitor is Lee Hae-Rang (Park Ki-Woong), who trained in the same North Korean Special Forces Unit. Lee Hae-Rang has also received orders from North Korea to work covertly as a spy in South Korea. His persona is that of a young wannabe rock star. Lee Hae-Rang finds it difficult, because he never played the guitar before. Shortly later, Ri Hae-Jin (Lee Hyun-Woo), also a member of their special forces team in North Korea, arrives in the same neighborhood. While the three young men live unnoticed among their neighbors, they await orders from North Korea. Their order finally arrives.
- Based on webcomic "Covertness" by Hun (birthname Choi Jong-Hoon). "Covertness" was first published from June 30, 2010 to May 4, 2011 on Daum website.
- Director Juhn Jai-Hong was originally hired to direct the movie "Secretly Greatly," but withdrew over scheduling differences with the production company. Juhn Jai-Hong wanted to begin filming the movie at a later date than what the production company wanted.
- Filming began October 17, 2012.
- Filming ended March 8, 2013. Shooting took 5 months to complete. The last scene filmed took place in an alley in a low income neighborhood. The scene involved Dong-Goo (Kim Soo-Hyun) and Hae-Jin (Lee Hyun-Woo) watching something secretly.
- "Secretly Greatly" broke the box-office record for most ticket sales in its first day of release by a Korean film. Previous record was held by movie "The Thieves," which sold 436,596 tickets. "Secretly Greatly" sold 498,284 tickets on its first day of release June 5, 2013.
- On the movie's second day of release, June 6, 2013, "Secretly Greatly" broke the all-time single day ticket sales record for a Korean film. "Secretly Greatly" sold a total of 919,036 tickets on June 6, 2013, easily surpassing "The Thieves," which previously held the one day record with 759,590 admissions. U.S. film "Transformers 3" holds the all-time single day record with 956,500 admissions.
|Kim Soo-Hyun||Park Ki-Woong||Lee Hyun-Woo|
|Won Ryu-Hwan/Bang Dong-Gu||Lee Hae-Rang||Ri Hae-Jin|
|Son Hyun-Joo||Park Hye-Sook||Hong Kyoung-In||Kim Sung-Kyun||Ko Chang-Seok|
|Kim Tae-Won||Jun Son-Lim||Jo Doo-Suk||Seo Soo-Hyuk||Seo Sang-Goo|
|Lee Chae-Young||Park Eun-Bin||Choi Woo-Sik||Jang Gwang||Shin Jung-Keun|
|Ran||Yoon Yoo-Ran||Yoon Yoo-Joon||Ko Young-Gam||Mr. Park|
Additional Cast Members:
- Lee Yeon-Kyung - mother of two young boys who torment Bang Dong-Goo
- Kim Pub-Lae - National Intelligence Service Director
- Goo Seung-Hyun - Chi-Woong
- Um Tae-Goo - Hwang Jae-Oh
- Jo Young-Jin - Kim Hee-Kwan
- Jo Yong-Jin - Se-Woong
- Yoon Won-Suk - big guy
- Sung Yoo-Bin - Ri Hae-Jin (young)
- Jung Young-Ki - mailman 1
- Joo Hyun - Ri Moo-Hyuk
- Kang Eun-Tak - National Intelligence Service Agent C
- 2013 (12th) New York Asian Film Festival - June 28-July 15, 2013 *International Premiere
- 2013 (17th) Puchon International Fantastic Film Festival - July 18-28, 2013 - Puchon Choice: Feature
- 2013 (17th) Fantasia Film Festival - July 18-August 7, 2013 *Canadian Premiere
- 2014 (43rd) International Film Festival Rotterdam - January 22-February 2, 2014 - Signals: How to Survive *European Premiere