Around 2008, Hwang Dong-hyuk had tried unsuccessfully to get investment for a different movie script that he had written, and he, his mother, and his grandmother had to take out loans to stay afloat, but still struggled amid the debt crisis within the country.[5][38][f] He spent his free time in a Manhwabang (South Korean manga cafe) reading Japanese survival manga such as Battle Royale, Liar Game and Gambling Apocalypse: Kaiji.[40][41][4][42] Hwang compared the characters' situation in these works to his own current situation and considered the idea of being able to join such a survival game to win money to get him out of debt, leading him to write a film script on that concept throughout 2009.[42] Hwang stated, "I wanted to write a story that was an allegory or fable about modern capitalist society, something that depicts an extreme competition, somewhat like the extreme competition of life. But I wanted it to use the kind of characters we've all met in real life."[43] Hwang feared the storyline was "too difficult to understand and bizarre" at the time.[40] Hwang tried to sell his story to various Korean production groups and actors, but had been told it was too grotesque and unrealistic.[44] Hwang put this script aside without any takers, and over the next ten years successfully completed three other films, including the crime drama film Silenced (2011) and the historical drama film The Fortress (2017).[42]
In the 2010s, Netflix had seen a large growth in viewership outside of North America, and started investing in productions in other regions, including Korea.[45] In 2018, Ted Sarandos, co-CEO of Netflix, stated that they were looking for more successes from overseas productions: "The exciting thing for me would be if the next Stranger Things came from outside America. Right now, historically, nothing of that scale has ever come from anywhere but Hollywood."[46] Netflix had opened up a division in Asia in 2018, and while they were still operating out of temporary leased office space in Seoul, Hwang brought his script to their attention. Kim Minyoung, one of Netflix's content officers for the Asian regions, recognized Hwang's talent from The Fortress and his other films, and upon seeing his script for Squid Game, knew they needed it for the service. Kim said "[W]e were looking for shows that were different from what's traditionally 'made it,' and Squid Game was exactly it".[47] In September 2019 Netflix formally announced that they would produce Hwang's work as an original series.[44][48] Netflix's Bela Bajaria, head of global television operations, said of their interest in Hwang's work that "we knew it was going to be big in Korea because it had a well-regarded director with a bold vision", and that "K-Dramas also travel well across Asia".[45] Regarding his return to the project, Hwang commented, "It's a sad story. But the reason why I returned to the project is because the world 10 years from then has transformed to a place where these unbelievable survival stories are so fitting, and I found that this is the time when people will call these stories intriguing and realistic."[40] Hwang further believed that the COVID-19 pandemic impacted the economic disparity between classes in South Korea, and said that "All of these points made the story very realistic for people compared to a decade ago".[44]
With the Netflix order, the film concept was expanded out to a nine-episode series. Kim stated that there was "so much more than what was written in the 120-minute format. So we worked together to turn it into a series."[47] Hwang said he was able to expand the script so that it "could focus on the relationships between people [and] the stories that each of the people had".[49] Initially, Netflix had named the series Round Six, rather than Squid Game as Hwang had suggested; according to Netflix's vice president for content in Asia Kim Minyoung, while they knew that the name "squid game" would be familiar to Korean viewers from the children's game, it "wouldn't resonate because not many people would get it", and opted to use Round Six as it self-described the nature of the competition. It has been titled as such in Brazil. As production continued, Hwang pushed on the service to use Squid Game instead; its cryptic name and unique visuals helped to draw in curious viewers, according to Kim.[48][50] At the time that Hwang wrote the series, his goal was to have the series reach the most-watched show in Netflix in the United States for at least one day.[5] Hwang had initially written the series as eight episodes, which was comparable to other Netflix shows, but found that the material for the last episode was longer than he planned, so it was split into two.[51]
Hwang wrote all of the series himself, taking nearly six months to write the first two episodes alone, after which he turned to friends to get input on moving forward.[43] Hwang also addressed the challenges of preparing for the show which was physically and mentally exhausting, saying that he had forgone dental health while making Season 1 and had to have six teeth pulled by his dentist after production was complete.[40][51] As such, Hwang was initially unsure about a sequel after completing these episodes,[43] though he wrote the ending to keep a potential hook for a sequel in mind.[5] Hwang had considered an alternate ending where Gi-hun would have boarded the plane after concluding his call with the game organizers to see his daughter, but Hwang said of that ending, "Is that the right way for us to really propose the question or the message that we wanted to convey through the series?"[68]
Hwang said he chose to cast Lee Jung-jae as Gi-hun as to "destroy his charismatic image portrayed in his previous roles".[71] HoYeon Jung was requested by her new management company to send a video to audition for the series while she was finishing a shoot in Mexico and preparing for New York Fashion Week. Although this was her first audition as an actor and her expectations were low, Hwang said, "The moment I saw her audition tape from New York, I immediately thought to myself, 'this is the girl we want.' My first impression of her was that she is wild and free like an untamed horse".[72][73][74] On casting Anupam Tripathi as Ali Abdul, Hwang said, "It was hard to find good foreign actors in Korea." He chose Anupam Tripathi because of his emotional acting capabilities and fluency in Korean.[75] Both Gong Yoo and Lee Byung Hun had worked with Hwang during his previous films, Silenced and The Fortress respectively, and Hwang had asked both to appear in small roles within Squid Game.[72][unreliable source?] The VIPs were selected from non-Korean actors living in Asia; in the case of Geoffrey Giuliano, who played the VIP that interacted with Jun-ho, his prior role from Train to Busan Presents: Peninsula led to his casting for Squid Game.[26]
In April 2022, Hwang confirmed that the characters of Gi-hun and the Front Man will return for the second season, and will introduce Cheol-su, Young-hee's boyfriend.[77][59] Hwang said that he would like to bring back some of the dead characters, such as Ji-young, and expressed regret that he had killed off several beloved characters since he did not have any plans for a second season at that time.[78]
During Netflix's Tudum: A Global Fan Event in June 2023, Lee Jung-jae was confirmed to reprise his role alongside Lee Byung-hun, Gong Yoo and Wi Ha-joon. On June 29, Netflix released more info on the new season's cast, which includes Kang Ha-neul, Park Sung-hoon, Im Si-wan, Yang Dong-geun, Park Gyu-young, Lee Jin-wook, Won Ji-an, Jo Yu-ri, Kang Ae-shim, Lee David, and Roh Jae-won.[79][29][28] Controversy arose when it was revealed that T.O.P, a former member of the band BigBang with a drug-related conviction during military service in 2016, was cast in the second season.[80]
Production and filming of the series ran from June to October 2020, including a mandatory month-long break due to the COVID-19 pandemic.[81] City scenes were filmed in Daejeon,[82] while the island set pieces were filmed on Seongapdo located in Ongjin.[83]
As Netflix was targeting the work for a global audience, the visuals were emphasized and some of the rules of the children's games were simplified to avoid potential issues with the language barrier.[44] The colorful sets and costumes were designed to look like a fantasy world. The players and soldiers each wear a distinctive color, to reduce the sense of individuality and emphasize the difference between the two groups.[41] The green tracksuits worn by the players were inspired by 1970s athletic wear, known as trainingbok (Korean: 트레이닝복).[84] The maze-like corridors and stairs drew inspiration from the 4-dimensional stair drawings of M. C. Escher including Relativity. Production designer Chae Kyoung-sun said these seemingly infinite stairways represented "a form of bondage for the contestants".[85] The complex network of tunnels between the arena, the dorm, and the administrative office was inspired by ant colonies.[41]
Chae was also inspired by the Saemaul Undong political initiative of the 1970s aimed to modernize rural Korean villages.[86] The mint green and pink color theme throughout the show were a common theme from Korean schools in the 1970s and 1980s. Green-suited characters develop associations of fear with pink through its use in guard outfits and the stairway room.[87][85]
The players' dormitory was envisioned with the concept of "people who are abandoned on the road" according to Chae; this was also used in the tug-of-war game.[87] The room was designed using white tiles and the curved opening like a vehicular tunnel. The bed and stairs initially were laid out to look like warehouse shelves, but as the episodes progressed and these furnishing used as makeshift defenses, they took the appearance of broken ladders and stairs, implying the way these players were trapped with no way out, according to Chae.[87] The dinner scene that took place in the eighth episode was inspired by the art installation The Dinner Party by Judy Chicago.[85] Walls of many of the areas where the games took place were painted in skies inspired by The Empire of Light series by Ren Magritte.[85]
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