Friend () is a 2001 South Korean film written and directed by Kwak Kyung-taek.
 Upon its release, it became the highest-grossing South Korean movie of all time.
 Its record was surpassed in 2003 by "Silmido".
No Tears for the Dead (; literally Crying Man) is a 2014 South Korean action thriller film written and directed by Lee Jeong-beom, about a professional hitman (Jang Dong-gun) who is conflicted about killing his last target (Kim Min-hee).
Good Morning President () is a 2009 South Korean film written and directed by Jang Jin that takes viewers to the private quarters of the Blue House during the terms of three fictional presidents (played by Lee Soon-jae, Jang Dong-gun and Go Doo-shim), each trapped between political and ethical choices.
 It was chosen as the opening film of the 14th Busan International Film Festival and was released in theaters on October 22, 2009.
The Promise is a 2005 Chinese epic fantasy film directed by Chen Kaige, starring Jang Dong-gun, Hiroyuki Sanada, Cecilia Cheung and Nicholas Tse.
 It is loosely adapted from "The Kunlun Slave", a "wuxia" romance story written by Pei Xing in the ninth century during the Tang dynasty.
 Responses to the film were mainly mixed to negative.
V.I.P. (Hangul: 브이아이피 ; RR: "Beu-i-a-i-pi " ) is a 2017 South Korean noir thriller film directed by Park Hoon-jung and starring Jang Dong-gun, Kim Myung-min, Park Hee-soon and Lee Jong-suk.
 The film was released on August 23, 2017.
Jang Dong-gun (born March 7, 1972) is a South Korean actor.
 He is best known for his leading roles in the films "Friend" (2001) and "Taegukgi: The Brotherhood of War" (2004).
The Warrior's Way is a 2010 New Zealand-South Korean fantasy action film written and directed by Sngmoo Lee and starring Jang Dong-gun, Kate Bosworth, Geoffrey Rush, Danny Huston and Tony Cox.
 It was produced by Barrie Osborne, who also produced "The Lord of the Rings".
 The film was released on December 3, 2010.
My Way () is a 2011 South Korean war film by Kang Je-gyu which stars Jang Dong-gun along with Japanese actor Joe Odagiri and Chinese actress Fan Bingbing.
Typhoon () is a 2005 South Korean action film directed by Kwak Kyung-taek and starring Jang Dong-gun, Lee Jung-jae and Lee Mi-yeon.
Love Wind Love Song () is a 1999 South Korean romance film about a Seoul businessman (Jang Dong-gun) who comes to Jeju Island and meets a lonely tour guide (Ko So-young).

Question: What is the nationality of both Jang Dong-gun and the film called Friend?
Answer: South Korean