“100 Days of Deception” Brings a Colonial-Era Spy Romance to tvN

A new Korean period drama is leaning on an old, reliable formula — danger, disguise and a romance that is not supposed to happen. “100 Days of Deception” premiered on tvN on October 10, opening a weekend run that is also streaming worldwide on Netflix.

The setting does a lot of the heavy lifting. The series unfolds in 1932 Gyeongseong, the colonial-era name for Seoul under Japanese occupation, a period Korean television returns to often because it packs built-in stakes: surveillance, resistance and the constant risk of exposure sit underneath every scene.

The setup

As Soompi described it, Kim Yoo-jung plays Lee Ga-kyung, the city’s most gifted pickpocket, who ends up undercover as an interpreter trainee. Park Jinyoung — long known as a member of the group GOT7 — plays Kim Tae-woong, an elite interpreter operating under an assumed identity. The “100 days” of the title is the clock on a mission, and the drama mines the tension of two people whose jobs depend on lying to everyone, including, increasingly, each other.

It is a stacked production. The series is directed by Yoo In-sik, whose past credits include some of the country’s most successful dramas, and it carries the weight of being positioned as a marquee weekend title for the network. The supporting cast fills out the era’s web of resistance fighters and colonial officials.

A steady start

Early numbers suggest it is connecting. In its review, The Korea Times noted the drama had pushed past 7 percent in nationwide ratings after only two episodes — a healthy figure for a weekend series in a crowded field, and the kind of start that gives a show room to build word of mouth over its run.

The soundtrack is doing its part, too. The first official OST, “Together,” performed by Kim Tae-rae of the group ZEROBASEONE, arrived on October 18 and slotted into an early episode — the now-standard K-drama move of pairing a rising idol voice with a prestige production to widen the audience on both sides.

For viewers outside Korea, the appeal is the combination: a handsome, high-stakes period piece with a slow-burn romance, released weekly and available the same week on a global platform. The weekly cadence is deliberate — it keeps the mission’s ticking clock in sync with the audience’s, and gives a colonial-era thriller the week-by-week suspense the format was built for.