Best Sci-Fi Manhwa: 9 Space, AI, and Dystopia Picks

The best sci-fi manhwa to start with is Nano List if you want something short and finished, or Denma if you want the biggest swing the genre has. Every pick below is actually about space, machines, alien invasion or the near future. That rules out the usual impostors: Solo Leveling has a stat window, not a spaceship, and Nano Machine is a cultivation story with a nanotech upgrade.

Three sci-fi manhwa covers side by side: Denma's deadpan quanx courier, Nano List's brown-haired girl with a blackened clawed hand, and TACIT's survivors walking past purple crystals

Eight of the nine are finished in Korea, and seven have a completed English run on WEBTOON. The two exceptions are worth knowing before you start: Knight Run's English edition stopped years ago, and Cheolsu Saves the World is on Manta, not WEBTOON.

Best Sci-Fi Manhwa for Space Opera

1. Denma

Denma Korean volume 1 cover: a deadpan child with gray skin, round ear-like shapes on his head and wide black eyes stares straight out under the title DENMA THE QUANX Denma (cover via AniList).

Silverquick is an intergalactic courier company that hires quanx, people with special abilities, as delivery men. Dike, known as the Merciless Death of Planet Urano, ends up in debt to Silverquick and trapped in the body of a small child named Denma, and he makes deliveries across the galaxy to pay it off and get his body back. Yeong-Sun Yang ran it on Naver Webtoon from 2010 to 2019 for 1,414 chapters.

It starts as deadpan short gags and turns into dense space opera, and it's the space opera manhwa most English-reading fans have never opened. WEBTOON's English run is marked completed. Pick it if you want one series to live in for months.

2. Knight Run

Knight Run cover: silhouetted figures in long coats walk along a tilted edge against a dusky sky, with the title knight run below Knight Run (cover via AniList).

In an era of space exploration, humanity is losing a war against monsters of unknown origin, and the Knights are its last hand. Sung Min Kim started it in 2009 and it's still running on Naver Webtoon: the latest Korean episode went up on October 30, 2026, in the second part of the New World arc.

The catch is English. WEBTOON's English edition is marked completed but stops at Episode 168, an extra story from August 2017, so you can read the early arcs and then you're out of road. Readers still bring it up; in an October 2026 r/manhwa thread one reply put it simply: "for anyone who wants to read sci fi peak, Knight Run."

Alien Invasion and Apocalypse

3. HIVE

HIVE Korean cover: a gray-haired older man smoking beside a younger man in a tactical vest holding an assault rifle HIVE (cover via AniList).

Giant, oxygen-doped bees are trying to take over by reversing the food chain, and Lee, a middle manager at a big company, has one goal: get his family through the bug apocalypse. That ordinary hero is the hook. He isn't built for this, and HIVE gets both its tension and its dark comedy from that. Gyu-Sam Kim finished it at 243 chapters, and the English run on WEBTOON is complete.

4. Duty After School

Duty After School Korean volume 1 cover: a blonde student in a school uniform with tactical straps stands in profile against a teal background marked with targeting graphics Duty After School (cover via AniList).

Strange things appear in the sky, the world starts dying, and Korea runs out of soldiers, so high school and college students are pulled into the military. Il-Kwon Ha's original is short (50 chapters, finished in 2013) and bleak, and it doesn't protect its cast. TVING adapted it as a 10-episode live-action series that aired from March 31 to April 21, 2023. The English run is complete on WEBTOON.

AI, Androids, and Machine Intelligence

5. Nano List

Nano List Korean cover: a brown-haired girl with pink eyes in a red top, one hand turning black and clawed with red lights Nano List (cover via AniList).

Milo lives in a world where androids are normal, and now he lives with two of them, built by his sister. One is a "bodyguard android" with deadly strength, and he's about to find out why she thought he needed it. Song-A Min finished it at 146 chapters, and WEBTOON's English run is complete. It's the easiest way into the genre: a single house, a clear premise, and no stat windows.

6. If AI Ruled the World

If AI Ruled the World Korean cover: a dark-haired young man in glasses stands in front of glowing blue android silhouettes and a neon city If AI Ruled the World (cover via AniList).

AI drives your car, looks after you when you're sick and solves your problems, and the cost of that convenience is the story. POGO and HOOPA keep it short, 52 chapters including one extra, so it's a good test if you're not sure AI dystopia is for you. The title oversells it a little: it's less a robot takeover than a question about whether people and AI can live together.

Dystopian Mystery and Near-Future Collapse

7. Parallel City

Parallel City Korean cover: a dark-haired man in a black shirt looks down while smaller figures fall and run across a gray city Parallel City (cover via AniList).

People across a city start seeing their own doubles, and then people start disappearing. Goda's series is mystery first and sci-fi second, which is why most roundups skip it. It finished at 149 chapters and holds its answer back for a long time, which you'll either love or find slow. The English run on WEBTOON is complete.

8. TACIT

TACIT cover: four survivors in winter coats walk through falling snow past jagged purple crystals while green-lit drones hover overhead TACIT (cover via AniList).

In the near future, strange crystals give off a zombie virus, and Ruby lives in the Amina Safe Zone with her father. Then she meets Arvan, a white-haired young man with pale skin and no heartbeat, and Ruby's quiet life is over. Dazzi Kim finished it at 85 chapters. It's warmer than most virus stories, and it's complete in English on WEBTOON and also on Tappytoon.

9. Cheolsu Saves the World

Cheolsu Saves the World Korean cover: an office worker in glasses and a suit stands calmly under a red sky bursting into shards Cheolsu Saves the World (cover via AniList).

Humanity fails to stop a giant asteroid, and an ordinary Korean office worker named Cheol-Su gets sent back in time to stop it. Suseon draws it from Gajjagwahakja's original story, and it plays the end of the world straight while letting Cheol-Su be hilariously out of his depth. It's finished at 69 chapters. In English it's on Manta; the Lezhin listings are French and German, so don't go looking for it on WEBTOON.

Our Take on the Best Sci-Fi Manhwa

We'd start with Nano List, then decide which way to go: Denma if you want space and scale, HIVE or Duty After School if you want an invasion that hurts. If you came here from Bad Born Blood, readers asking for exactly that in an October 2026 r/manhwa thread listed "Knight Run," "Cosmic Heavenly Demon" and "Afterschool Military Activity" (that's Duty After School) as the "longer or finished scifis." Our Bad Born Blood guide covers that series itself.

Sweet Home and God of Blackfield turn up on a lot of sci-fi lists. We left them off because neither runs on technology: Sweet Home is monster horror, and God of Blackfield is a soldier shot in battle who wakes up three years later as a bullied high schooler.

Denma's run is extreme even by webtoon standards. For more series built to go the distance, see
Best Long Running Manhwa →

How We Checked This

We checked every premise, chapter count and status on AniList, every English edition on WEBTOON, Manta and Tappytoon, and Knight Run's Korean run on Naver Webtoon, and logged each in our sources table. This pass corrected two platform claims: Knight Run's English edition stopped in 2017, and Cheolsu Saves the World isn't on Lezhin in English.

Last reviewed: October 14, 2026

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