Some undercover missions start with ambition. Others start because there’s simply no other choice. In tvN’s upcoming period drama 100 Days of Deception, Kim You-jung plays a woman who never wanted to be a spy — she just wanted to leave the country. Instead, she ends up infiltrating the very government trying to stop people like her from escaping.
Here’s everything the newly released poster and plot details confirm.
100 Days of Deception: Overview
| Detail | Information |
|---|---|
| Lead actress | Kim You-jung |
| Co-lead | Park Jinyoung (GOT7) |
| Director | Yoo In Shik (Extraordinary Attorney Woo, Dr. Romantic) |
| Genre | Period spy romance |
| Setting | Japanese occupation of Korea, Gyeongseong |
| Network | tvN |
| Premiere date | October 10, 2026 |
| Time slot | 9:10 PM KST |
What’s the Story?
Kim You-jung plays Lee Ga Kyeong, the top pickpocket in Gyeongseong (present-day Seoul), whose dream is simple: save up enough money to leave for America. That plan gets derailed when a sniper from an anti-Japanese resistance group makes her an offer she can’t refuse, pulling her into the country’s independence movement as an undercover operative.
To pull off her mission, Lee Ga Kyeong assumes a false identity and infiltrates the Japanese Government-General of Korea disguised as an interpreter trainee. It’s there that she becomes entangled with Kim Tae Woong, played by GOT7’s Park Jinyoung — a newly appointed interpreter who also goes by Sato Hideo and happens to be the adopted son of the Inspector-General of Korea, the second-highest-ranking official in the entire administration.
What the First Poster Shows
The newly unveiled poster captures Lee Ga Kyeong stepping into the Japanese Government-General building for the first time, glancing back at the camera with a look that mixes vigilance with quiet determination. The tagline sums up her circumstances perfectly: a girl who dreamed of heading to America ends up infiltrating the very institution standing in her way.
Why This Drama Is Worth Watching
Director Yoo In Shik has a strong track record with emotionally grounded, high-stakes storytelling, having helmed hits like Extraordinary Attorney Woo and the Dr. Romantic franchise. Pairing that pedigree with a politically charged historical backdrop and a slow-burn spy romance gives 100 Days of Deception the kind of premise that tends to resonate strongly with K-drama audiences.
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