She started out stealing wallets. Now she’s stealing secrets, and the man whose wallet she took is waiting at her new workplace.
In Episode 3, Kim Yoo-jung finally steps into the world of espionage. This is tvN’s period spy romance, set during the Japanese occupation of Korea, and Ga Kyeong’s double life begins now.
100 Days of Deception: Drama Snapshot
| Detail | Info |
|---|---|
| Drama | 100 Days of Deception |
| Network | tvN |
| Genre | Period spy romance |
| Leads | Kim You Jung (Lee Ga Kyeong), Park Jinyoung of GOT7 (Kim Tae Woong / Sato Hideo) |
| Key supporting cast | Kim Hyun Joo, Lee Moo Saeng, Jin Sun Kyu |
| Episode 3 airs | October 17, 9:10 p.m. KST |
Where We Left Off?
Ga Kyeong is a sharp-witted pickpocket who becomes an undercover agent for the independence movement. Her mission is to infiltrate the Japanese Government-General of Korea.



Episode 2 left her in a tough spot. The police suspected her of being involved in a plot against Sato Shinichi. Yoo So Ran (Kim Hyun Joo) then blamed her for wrecking a revenge plan 13 years in the making. After learning of So Ran’s miscarriage, Ga Kyeong felt guilty and refused the money she was offered.
Episode 3 Preview, Beat by Beat
1. She comes back. In the new stills, Ga Kyeong returns to Yoo So Ran with a cut lip, dirty clothes and a determined look. This is a different woman from the one who walked away last time.
2. A deal is made. So Ran offers to help her reach her dream of going to the United States, but only if she takes a spy mission. Yoo Philip (Lee Moo Saeng) still doesn’t trust the young thief.
3. A new look, a new life. Ga Kyeong joins the Gugukdan and goes undercover as an interpreter trainee. Her short bob and Western-style outfit show how far she is from her old life.
4. The fourth encounter. She first stole Sato Hideo’s wallet. They met again at Yoo Philip’s house and at the pawn shop. Now they’re trainee and senior interpreter. Park Jinyoung’s character is the adopted son of the Inspector-General of Korea, the second-highest-ranking official in the administration, which makes him a very risky man to get close to.
Why You’ll Want to Watch?
- High stakes: One slip could expose her, so every scene carries tension.
- Romance with danger: A spy falling for the enemy’s circle is a classic setup, and it works here.
- Layered characters: Everyone seems to have a motive, a secret or both.
The production team has teased that her “precarious double life” will bring unpredictable suspense. Her first mission and what it will cost her are still unknown.
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FAQs
Q1. When does Episode 3 of 100 Days of Deception air?
It airs on October 17 at 9:10 p.m. KST on tvN. Availability elsewhere depends on your streaming platform.
Q2. Who stars in 100 Days of Deception?
Kim You Jung plays spy Lee Ga Kyeong. GOT7’s Park Jinyoung plays interpreter Kim Tae Woong, also known as Sato Hideo.





