2006–2017: Hula Girls, Villain, and Rage
In 2006, Lee directed and co-wrote Hula Girls, a produced and distributed by Cinequanon. Based on a true story set in Iwaki City, Fukushima Prefecture approximately 40 years prior, the film depicts the early days of the Joban Hawaiian Center (currently the Spa Resort Hawaiians) as it attempted to transition the town from a declining coal industry to a tourism industry utilizing hot springs. The project was initiated after Hitomi Ishihara, a producer at Cinequanon, visited the Spa Resort Hawaiians for another film shoot and became interested in the history of its founding. Following its release, the film garnered strong support through word of mouth, eventually exceeding 1.3 million admissions and 1.5 billion yen in box-office revenue. Hula Girls won Best Film at the 19th Nikkan Sports Film Awards in December 2006. On January 9, 2007, it was selected as the number one Japanese film at the 80th Kinema Junpo Best Ten awards. Furthermore, at the 30th Japan Academy Film Prize in February 2007, the film won Picture of the Year, while Lee won Director of the Year and Screenplay of the Year. The film was also submitted as Japan's official entry for Best Foreign Language Film at the 79th Academy Awards.
In March 2007, Lee received the Art Encouragement Prize for New Artists in the film category from the Agency for Cultural Affairs, an honor awarded annually to artists who have broken new ground in their respective fields. Upon receiving the award, Lee stated, "I will simply continue to give my all to each film, one by one. With this recognition comes greater scrutiny from others, so I must be even stricter with myself. I want to strive to deliver high-quality works."
In 2008, Lee contributed to The Short Films: We Were All Once Children, an omnibus of five short films centered on the theme of children, which was produced by Asahi Broadcasting Corporation in Osaka to commemorate the relocation of its headquarters. Lee directed the short Tagatame, which utilizes a clever narrative twist to depict the struggles of a terminally ill man (played by Tatsuya Fuji) who worries about the future of his 29-year-old intellectually disabled son. The anthology, featuring additional shorts directed by Kazuyuki Izutsu, Kazuki Omori, Yoichi Sai, and Junji Sakamoto, was presented at a free commemorative screening in July 2008.
In November 2009, filming began in Kyushu region for Villain, a film adaptation of Shuichi Yoshida's suspense novel about a construction worker who murders a woman and flees across three prefectures in Kyushu with another woman. Lee directed the film and co-wrote the screenplay with Yoshida. Distributed by Toho, the film stars Satoshi Tsumabuki and Eri Fukatsu, and features a musical score by Joe Hisaishi. Villain was completed in April 2010 and released in September of that year. The film was highly acclaimed and garnered numerous accolades, including Best Actress for Fukatsu at the 34th Montreal World Film Festival. It won Best Film at the 23rd Nikkan Sports Film Awards, as well as Best Picture and Best Actress (for Fukatsu) at the 35th Hochi Film Awards. Furthermore, Villain was ranked as the number one Japanese film at the Kinema Junpo Best Ten, where Lee won Best Director and shared the Best Screenplay award with Yoshida. Villain grossed 1.98 billion yen at the box office.
In August 2012, Warner Bros. announced that Lee would direct a Japanese jidaigeki remake of Clint Eastwood's 1992 Western film Unforgiven, retaining the same title. Produced and distributed by Warner Bros., the Japanese adaptation is set in Hokkaido during the early Meiji era. The film stars Ken Watanabe as the protagonist, a remnant of the Tokugawa shogunate who was feared as Jubei the Killer by the Satcho forces during the Bakumatsu period. He faces off against Ichizo Oishi (played by Koichi Sato), a police chief who currently controls the town after being passed over for promotion despite his background in the Imperial army. Filming took place entirely in Hokkaido, beginning in late September 2012, where a large open set was constructed for the production. The film was released in September 2013.
Lee directed and wrote the screenplay for Rage, reuniting with Shuichi Yoshida to adapt his 2014 novel of the same name. Produced and distributed by Toho, the ensemble drama revolves around the unsolved murder of a married couple in Tokyo and three mysterious men who subsequently appear in Tokyo, Okinawa, and Chiba. The film stars Ken Watanabe, Aoi Miyazaki, Satoshi Tsumabuki, and Suzu Hirose, featuring a musical score by Ryuichi Sakamoto, and was released in September 2016. Reflecting on Lee's rigorous directing style, Hirose recalled, "To Director Lee, my acting must have been out of the question. He didn't hold back in saying things that are usually difficult to say, tearing everything I did to shreds. I was desperately trying to catch up while feeling incredibly frustrated." Rage grossed 1.61 billion yen at the box office, and Lee won Best Director at the 41st Hochi Film Awards for his work on the film. Furthermore, at the 40th Japan Academy Film Prize announced in January 2017, Rage received the most honors of the year, securing Excellent Awards in 11 categories with a total of 12 awards. These included Excellent Picture, Excellent Director for Lee, and acting awards for Miyazaki, Tsumabuki, Mirai Moriyama, and Hirose.
In 2017, Lee contributed to the omnibus film The Blue Hearts ga Kikoeru (The Blue Hearts), a project celebrating the 30th anniversary of the legendary Japanese rock band The Blue Hearts. Lee directed the short film "1001 no Violin" (1001 Violins), starring Etsushi Toyokawa. The drama follows a former worker at the Fukushima Daiichi Nuclear Power Plant who evacuated to Tokyo with his family following the 2011 Great East Japan earthquake and tsunami. Three years after the disaster, struggling with his unresolved feelings, he returns to Fukushima to search for the dog they left behind. Pursuing strict realism, Lee insisted on shooting the segment on location in Fukushima, utilizing actual homes borrowed from evacuees while monitoring radiation levels with Geiger counters. He stated that filming anywhere else was not an option, as the fictional story was deeply rooted in the harsh realities faced by actual victims. Although the omnibus project initially faced the threat of cancellation due to the production company's financial difficulties, it was ultimately saved by a successful crowdfunding campaign and received a nationwide theatrical release in April 2017. Reflecting on the film's underlying message, Lee noted that it explores the struggle of individuals trying to protect their own conscience from suffocating under societal pressures, a theme he felt strongly resonated with the enduring and unyielding spirit of The Blue Hearts' music.