The Film Behind 'Attorney Woo' Is Being Remade in Japan

When screenwriter Moon Ji-won won the Grand Prize at the 5th Lotte Scenario Contest in 2016, beating out 964 entries with a script about a lawyer and an autistic witness, few could have predicted where that story would lead. The resulting film, Innocent Witness, drew 2.5 million viewers in Korean theaters. Its spiritual successor, Extraordinary Attorney Woo, became one of Netflix's most-watched non-English series ever. Now, TV Asahi has announced that it will bring the original story back to screens — this time as a Japanese drama premiering on April 18, 2026.

A Story That Keeps Growing

Released in February 2019, Innocent Witness tells the story of Yang Soon-ho, a corporate lawyer who has abandoned his ideals for career advancement, and Lim Ji-woo, an autistic teenage girl who is the sole witness in a murder case. Directed by Lee Han and starring Jung Woo-sung and Kim Hyang-gi, the film earned widespread critical acclaim for its warm portrayal of human connection across the divide of neurodivergence.

Jung Woo-sung's performance earned him the Daesang (Grand Prize) at the 55th Baeksang Arts Awards and Best Actor at the 40th Blue Dragon Film Awards — two of the most prestigious honors in Korean cinema. Kim Hyang-gi, who was just 19 at the time, won Best Actress at both the Korean Association of Film Critics Awards and the Golden Cinema Film Festival for her portrayal of Ji-woo.

But the film's most enduring legacy may be what came after. Moon Ji-won went on to create Extraordinary Attorney Woo, the 2022 ENA drama about an autistic rookie lawyer that became a global phenomenon on Netflix. The connection between the two works is not merely thematic — it is direct. The director of Attorney Woo has publicly stated that everything began as he watched Innocent Witness. In the film, Ji-woo's dream was to become a lawyer. As Jung Woo-sung himself observed in a 2024 interview, it feels like Ji-woo grew up and became Woo Young-woo.

Japan Picks Up the Story

The Japanese adaptation, titled Muku Naru Shonin (Innocent Witness), will air as a TV Asahi Drama Premium special — a prime-time slot reserved for high-profile single-episode dramas with notable casts. The approximately two-hour special is scheduled for Saturday, April 18, 2026, at 9:00 PM JST across TV Asahi and 24 affiliated stations.

The casting reflects the project's prestige. Veteran actor Karasawa Toshiaki, best known for the classic Japanese drama Shiroi Kyoto (White Tower), will play the lawyer role — renamed Hasebe Kyosuke for the Japanese version. Rising star Touma Ami, who has drawn attention for her work in Saiko no Kyoshi and Chihayafuru -Meguri-, takes on the challenging role of Koike Nozomi, the autistic witness.

Karasawa described his reaction to receiving the offer with characteristic enthusiasm, saying he was excited from the moment he heard about the project, particularly because it meant reuniting with colleagues. He noted that the courtroom scene drew him so deeply into the performance that it was a strange, almost transcendent experience. Touma, meanwhile, acknowledged the difficulty of the role, describing it as an unknown world. She worked closely with the director to find ways to portray a character whose actions and emotions do not always align — a challenge she met by developing several internal patterns for each scene.

Why Japan Chose This Film

Japanese entertainment outlets have been explicit about the marketing angle: they describe Innocent Witness as the origin point of Extraordinary Attorney Woo. Given the drama's massive popularity in Japan — where it ranked among the most-streamed Korean series — the connection gives the remake a built-in audience of viewers already emotionally invested in Moon Ji-won's storytelling universe.

The adaptation also represents a significant milestone in the evolving cultural exchange between Korea and Japan. Historically, the flow of entertainment content moved primarily from Japan to Korea, with Korean networks frequently remaking Japanese dramas. The direction has now decisively reversed. Major Japanese broadcasters like TV Asahi are investing in Korean-origin stories for their domestic prime-time schedules, treating them with the same prestige they would give original Japanese productions.

Innocent Witness is particularly well-suited for adaptation because its narrative contains no villains. Every character is drawn with empathy and warmth, and the story's central themes of justice, connection, and the courage to see another person clearly transcend cultural boundaries. Korean media analysts have noted that this universality is precisely what makes Korean stories adaptable across markets.

The Creative Team

The Japanese screenplay is written by Morishita Tada, known for the long-running detective series Aibo (Partners), with direction by Oikawa Takuro. The production has adapted the Korean legal setting to a Japanese context while preserving the emotional core of the original — the gradually deepening relationship between a cynical lawyer and a young woman who sees the world differently.

Karasawa offered a message to viewers who may have already seen the Korean original, suggesting that the Japanese version will draw them in naturally and directly. Touma expressed hope that audiences would find themselves empathizing with her character, calling the work heartwarming.

A Legacy Still Unfolding

Moon Ji-won's journey from unknown screenwriter to the creator of one of Korea's most successful cultural exports continues to expand. Since winning the Lotte Scenario Contest in 2016, she has seen her debut screenplay adapted into a hit Korean film, inspired a global Netflix phenomenon, and now generated a Japanese prime-time adaptation. She has since announced her directorial debut with Deaf Voice, a mystery thriller about a child of deaf adults.

For the Korean film industry, the TV Asahi remake is further confirmation that K-content has moved beyond being a trend and into a permanent fixture of the global entertainment landscape. When Innocent Witness premiered seven years ago, it was a modest human drama about empathy and justice. Today, its creative DNA has spread across continents, languages, and formats — proving that the best stories do not just entertain, they multiply.