The Blue Road's Original Comic: The Korea–Japan Manhwa Behind Son Suk-ku's Netflix Thriller
The Blue Road is not based on a webtoon. Netflix's Korea–Japan crime thriller adapts Blue Road (Pureun-gil), a five-volume print comic drawn by Kwon Ka-ya and written by Keishi Edogawa, published in Korea between 2002 and 2004. All eight episodes, starring Son Suk-ku and Eita Nagayama, arrive worldwide on Friday, November 20, at 5 p.m. Korea time.
The Original Comic Is Older Than the Webtoon Boom
Search for the source of The Blue Road and you will see the word "webtoon" a lot. It is the natural guess, since so many recent Korean series start life on a scrolling phone screen. This one does not. Netflix lists the series as based on a comic, and that comic is Blue Road, known in Korean as Pureun-gil, a print manhwa that Haksan Culture Publishing released in five volumes. The first volume came out in November 2002 and the fifth, the finale, in May 2004.
What makes the book unusual is how it was made. Blue Road was a Korea–Japan collaboration from the first page, which is exactly how Netflix describes it. The art is by Kwon Ka-ya, a Korean artist known for heavy, precise draftsmanship in books such as Namhansanseong and The Sun and the Moon. The story is credited to Keishi Edogawa, which the publisher's own listing identifies as a pen name of Takashi Nagasaki, the story writer behind Master Keaton, Pluto and Billy Bat. In other words, a celebrated Japanese mystery writer and a Korean artist built a cross-border crime story together, two decades before the streaming era made that kind of pairing feel ordinary.
The comic follows a Korean detective and a Japanese detective tracking a string of grotesque killings in both countries, and the series keeps that spine. The print volumes are long out of stock at major Korean bookstores, but a digital edition from the same publisher has been on sale in Korea since 2016. If you have followed other adaptation stories, such as the web novel behind Take Charge of My Heart, this is a rarer case: a finished, physical comic from the early 2000s rather than a hit that is still being serialized.
The Premise, Without Spoilers
Everything below comes from Netflix's own announcements, so none of it gives away more than the official material already has. In Tokyo, police find a body twisted into an unnatural shape, and next to it a message written in blood in Korean. Some time later a similar scene turns up in Korea, and this time the message is in Japanese. Each country is holding half of a puzzle, and neither can solve it alone.
So a Seoul detective and a Tokyo detective are pushed into working together. Netflix's own description stresses how different the two men are, in temperament and in the way they run an investigation, and the official poster line sums up the tone: twisted bodies, cryptic messages, bizarre murders that cross a border. Netflix files the show under dark thrillers and buddy-cop stories, and both labels fit. The dialogue moves between Korean and Japanese, and the series carries a 19+ rating in Korea, so expect a grim, adult crime story rather than a light procedural.
What the trailers keep hidden is the why. The question the marketing keeps asking is what the killer is trying to say, and the Korean synopsis ends on a quiet warning that the truth may be closer than anyone thinks. That is as far as the official material goes, and it is a good place to stop before the November release.
Who Plays Whom in The Blue Road
Son Suk-ku as Kim Seok. A detective with the Seoul Metropolitan Police Agency's mobile investigation unit. Son is best known abroad for My Liberation Notes and for the second season of D.P., which was also directed by Han Jun-hee, so this is a reunion.
Eita Nagayama as Inose. A detective in the First Investigation Division of Tokyo's Metropolitan Police Department. Nagayama, credited simply as Eita earlier in his career, is one of Japan's most recognizable screen actors, and here he works largely opposite a Korean cast.
Kim Shin-rock as Ri Yun-ok. A charismatic businesswoman from Japan's Korean community, the Zainichi, who becomes tied up in the case. At the Busan screenings the director credited Kim with studying the speech of many Zainichi Koreans to get the accent right.
Choi Sung-eun as a government agent who follows the case from a different position than the two detectives, and Jung Jae-young as a mysterious man whose identity Netflix has kept under wraps.
Behind the camera, Han Jun-hee directs. His track record runs from the films Coin Locker Girl and Hit-and-Run Squad to both seasons of D.P., and he was a creator on Weak Hero Class. The screenplay is by Jo Yu-jin, who adapted the comic together with Han.
Seoul, Tokyo and the Date on the Paperwork
The story lives in two cities. The case opens in Tokyo, the posters place each detective in a back alley of his own country, and the investigation shuttles between the two capitals. Netflix has not published a list of filming locations, so treat any fan-made location map with care until official details appear.
Netflix has not announced the year the story is set in, either, but the official preview drops a clue for anyone who pauses it. A cooperation request from the Seoul police, shown on a clipboard, is dated May 26, 2002, and a digital camera screen in another shot carries the same date. That is the spring Korea and Japan co-hosted the FIFA World Cup, and the year the original comic began. The director has hinted that the later episodes lean into the two detectives' friendship and the mood of their era, which fits a story set at a moment when the two countries were sharing a stage.
The production details back up the two-country spirit. The cast is split between Korean and Japanese actors, the dialogue switches languages from scene to scene, and the messages at each crime scene are written in the other country's language. If you enjoy watching Korean and Japanese screen culture borrow from each other, the Korean take on a Japanese hit in Doctor X makes an interesting companion piece.
Release Time, Episode Count and the Busan Preview
The Blue Road premieres on Netflix worldwide on Friday, November 20, 2026, at 5 p.m. Korea time, which is midnight Pacific Time on the same day. All eight episodes drop at once, so there is no weekly wait. Netflix announced the date on October 2 alongside two posters and a teaser trailer.
The series has already met an audience. It was officially invited to the On Screen section of the 31st Busan International Film Festival, which ran from October 6 to 15, and episodes one to three had their world premiere there. Son Suk-ku and Kim Shin-rock walked the opening-night red carpet, and the team, including Han Jun-hee and Eita Nagayama, met audiences at post-screening talks and an open talk at the Busan Cinema Center in Haeundae. Netflix brought several series to Busan this year, including the part-time-job horror covered in our guide to Dead-End Job.
For everyone else, the first three episodes stay under wraps until release day. If you want a head start, the official teaser on Netflix's YouTube channels is short and spoiler-light, and the digital edition of the comic is still available in Korea. Reading it first will not tell you everything about the series, which has twenty years of distance from its source and a cast of new faces, but it will show you where the story started.
Sori's Note
Here is the detail that interests me most: The Blue Road switches between Korean and Japanese, which means nearly every viewer will be reading subtitles for half of it. Korean speakers will need them for Inose's lines, Japanese speakers for Kim Seok's, and everyone else for both. That puts the whole audience in the same position as the two detectives, each understanding only part of what is said in the room.
A comic built by a Korean artist and a Japanese writer, turned into a series that makes everyone a little bit foreign. I can't think of a better way to tell a story about a message written in someone else's language.
