Question: Who were the co-writers of a 2017 action-adventure film that was directed by Bong Joon-ho?

Context paragraphs:
2011 Cannes Film Festival: The 64th Cannes Film Festival was held from 11 to 22 May 2011.  American actor Robert De Niro served as the president of the jury for the main competition and French filmmaker Michel Gondry headed the jury for the short film competition.  South Korean film director Bong Joon-ho was the head of the jury for the Caméra d'Or prize, which is awarded to the best first-time filmmaker.

The Host (2006 film): The Host (; lit.  "Monster") is a 2006 South Korean monster film directed by Bong Joon-ho and starring Song Kang-ho, Byun Hee-bong, Park Hae-il, Bae Doona and Go Ah-sung.

Okja: Okja is a 2017 action-adventure film directed by Bong Joon-ho and co-written by Bong and Jon Ronson.  The film stars an ensemble cast headed by South Korean child actress Ahn Seo-hyun, alongside Hollywood actors Tilda Swinton, Paul Dano, Steven Yeun, Lily Collins, and Jake Gyllenhaal.

Tokyo!: Tokyo!  is a 2008 French/Japanese/South Korean/German anthology film containing three segments written by three non-Japanese directors, all of which were filmed in Tokyo, Japan.  Michel Gondry directed "Interior Design", Leos Carax directed "Merde", and Bong Joon-ho directed "Shaking Tokyo".

2013 Deauville American Film Festival: The 39th Deauville American Film Festival took place at Deauville, France from August 30 to September 8, 2013.  Steven Soderbergh's drama film "Behind the Candelabra" served as the opening night film. " Snowpiercer" by Bong Joon-ho was the closing night film of the festival.  The Grand Prix was awarded to "Night Moves" by Kelly Reichardt.

Bong Joon-ho: Bong Joon Ho (, ] ; born September 14, 1969) is a South Korean film director and screenwriter.  His films include South Korean hits "Memories of Murder" (2003), based on a true-life serial murder case, monster movie "The Host" (2006), and his first English-language film, science fiction adventure "Snowpiercer" (2013).  His latest film is "Okja" (2017), a South Korean-American film, which competed for the "Palme d'Or" in the main competition section at the 2017 Cannes Film Festival.  "Okja" was subsequently released by Netflix on June 28, 2017.

Mother (2009 film): Mother () is a 2009 South Korean drama film directed by Bong Joon-ho, starring Kim Hye-ja and Won Bin.

Cure (film): Cure (キュア , Kyua ) is a 1997 Japanese psychological thriller film with elements of horror and film noir written and directed by Kiyoshi Kurosawa, starring Koji Yakusho, Masato Hagiwara, Tsuyoshi Ujiki and Anna Nakagawa.  The film was released to strong critical acclaim in both the East and the West, with critics praising Kurosawa's direction as well as the visuals and atmosphere.  In 2012, South Korean film director Bong Joon-ho listed the film as one of the greatest films of all time.

Snowpiercer: Snowpiercer (Hangul: 설국열차 ; Hanja: 雪國列車 ; RR: "Seolgungnyeolcha " ) is a 2013 English-language South Korean-Czech science fiction thriller film based on the French graphic novel "Le Transperceneige" by Jacques Lob, Benjamin Legrand and Jean-Marc Rochette.  The film is directed by Bong Joon-ho, and written by Bong and Kelly Masterson.  The film marks Bong's English-language debut; approximately 80% of the film was shot in English.

Memories of Murder: Memories of Murder () is a 2003 South Korean crime-drama film co-written and directed by Bong Joon-ho.  It is based on the true story of Korea's first serial murders in history, which took place between 1986 and 1991 in Hwaseong, Gyeonggi Province.  Song Kang-ho and Kim Sang-kyung star as Detective Park and Detective Seo, respectively, two of the detectives trying to solve the crimes.

Supporting paragraphs: Bong Joon-ho Okja
Answer: Bong and Jon Ronson