Kim You-jung and Park Jin-young are heading into colonial-era Gyeongseong for a new spy romance built around secrets, infiltration and a 100-day mission.
"100 Days of Deception" premieres on tvN in Korea on October 10 at 9:10 p.m. KST. Netflix also lists the series for October 10, while TVING will carry it in Korea.
One important correction: this is not a Netflix exclusive. It is a tvN drama that will also stream on Netflix.
3 FACTS
October 10 - Official premiere date on tvN and Netflix.
9:10 p.m. KST - Korean broadcast time on tvN.
Kim You-jung + Park Jin-young - Lead cast, alongside Kim Hyun-joo, Lee Mu-saeng and Jin Sun-kyu.
What is "100 Days of Deception"?
The official Netflix synopsis follows Gyeongseong's top pickpocket, who dreams of freedom and takes on her most dangerous job yet: infiltrating the Japanese colonial government to steal secrets.
TVING describes the series as a 100-day spy romance between a top pickpocket who becomes an intelligence operative and an elite interpreter working inside the Japanese Government-General.
That makes the basic setup clear.
This is not simply a period romance with espionage in the background. The romance begins inside an undercover mission.
Who plays whom?
Kim You-jung leads the series as the pickpocket at the center of the infiltration story.
Park Jin-young plays the elite interpreter she encounters inside the colonial administration.
The main cast also includes Kim Hyun-joo, Lee Mu-saeng and Jin Sun-kyu.
Netflix currently lists Kim You-jung, Park Jin-young and Kim Hyun-joo as the top-billed stars, with Lee Mu-saeng and Jin Sun-kyu among the broader cast.
For international viewers, Park Jin-young may also be familiar as Jinyoung of GOT7.
Why the setting matters
The series is set in 1930s Gyeongseong, the colonial-era name for Seoul.
That matters because the central conflict is not built around a fictional palace or a distant historical court. The heroine is infiltrating the Japanese colonial government itself.
Netflix classifies the show as a period piece, political drama and romantic drama, while its official page also tags it with political rebellion and secret-society themes.
The result is a series that appears to be using romance and espionage inside a specific political setting rather than treating the 1930s as visual decoration.
Exactly how deeply the drama engages with that history will only become clear after broadcast.
Who is making it?
The credited creators are directors Yoo In-sik and Kim Youn-jin, with writer Ryu Bo-ri.
TVING lists the same three creators on its official series page.
Studio Dragon has also included "100 Days of Deception" in its 2026 second-half drama lineup.
When and where can you watch it?
In South Korea:
- tvN: October 10 at 9:10 p.m. KST
- TVING: available in Korea, with the platform noting that TV broadcast and TVING availability times may differ
On Netflix:
- Netflix Tudum lists "100 Days of Deception" for October 10
- Netflix has an active official title page for the series
Netflix availability is clearly confirmed outside the Korean broadcast ecosystem, but current official materials do not provide a simple "available in every country worldwide" statement.
For that reason, SEEN IN KOREA is not describing the series as globally available in every Netflix market without exception.
Is it a Netflix Original?
No.
That is an important distinction.
"100 Days of Deception" is a tvN drama, with TVING also carrying it in Korea.
Netflix is an international streaming platform for the series, but the available official materials do not support calling it a Netflix-exclusive production.
That may sound like a small wording difference, but it matters when readers are deciding where and how they can watch.
What makes it worth watching?
The strongest hook is the combination of three things:
- an undercover female lead
- a romance that develops inside the target environment
- a 1930s Gyeongseong setting tied directly to colonial political power
That gives the series a different structure from a standard historical romance.
The question is not just whether the two leads fall for each other. It is what happens when personal trust develops inside a mission built on deception.
The official marketing is already leaning into that tension.
But viewers should be cautious about plot details circulating before the premiere. Any relationship twists, hidden identities or betrayals not stated in official materials remain unconfirmed.
What we still don't know
Exact regional Netflix availability - Netflix lists the show for October 10, but a complete country-by-country availability list has not been published in the official sources reviewed here.
How closely the drama will follow real historical institutions and events - the setting is clear, but the series is still a fictional drama.
How the central relationship develops - official materials establish the spy-romance premise, but major twists should not be treated as fact before broadcast.
WHY IT MATTERS
"100 Days of Deception" is arriving at a point when international K-drama viewers increasingly expect more than a generic historical romance.
Its pitch is more specific: a female pickpocket becomes an undercover operative inside the Japanese colonial government, where romance develops in the same space as the mission.
If the series can balance that political setting with its romance rather than using history as background decoration, it could stand out in a crowded October K-drama schedule.
WHAT TO WATCH NEXT
- The October 10 premiere and whether Netflix releases it simultaneously across major markets.
- How the drama explains colonial-era Gyeongseong to viewers without prior Korean history knowledge.
- Whether the espionage plot remains central after the romance develops.
- Official stills, character guides and episode information released by tvN as premiere week approaches.
For now, the confirmed pitch is already strong: a pickpocket, a secret mission, an elite interpreter and 100 days inside enemy territory.