Kim Yoo Jung and Park Jinyoung Meet in 1910s Gyeongseong in tvN’s ‘100 Days of Deception’

TvN unveiled the drama’s teaser on August 29, deliberately releasing the preview on Gyeongsul National Humiliation Day, the date associated with Japan’s formal annexation of Korea in 1910.

The historical connection immediately attracted attention online, especially given the drama’s setting and its story of espionage inside the Japanese colonial administration.

Kim Yoo Jung Becomes a Spy Inside the Government-General

“100 Days of Deception” is a historical spy romance set in colonial-era Gyeongseong.

Kim Yoo Jung plays Lee Ga Kyung, a gifted pickpocket who eventually becomes a secret agent and infiltrates the Japanese Government-General of Korea. Her mission begins under another identity, Geum Seo Hee, setting in motion what the teaser describes as the most dangerous lie of her life. The story follows the 100 days that unfold after she enters enemy territory.

According to the production team, Ga Kyung’s path will involve a life-or-death deal with independence fighters before she officially begins working undercover.

The drama is expected to combine espionage, political tension and romance as her mission becomes increasingly dangerous.

Park Jinyoung Plays an Elite Interpreter With a Complicated Identity

Opposite Kim Yoo Jung, Park Jinyoung takes on the role of Kim Tae Woong, also known as Sato Hideo.

The character is the adopted son of a high-ranking colonial official and works as a newly appointed elite interpreter for the Japanese Government-General.

His position places him directly at the center of the institution Ga Kyung is trying to infiltrate.

That sets up the drama’s central relationship: a secret agent operating under a false identity and a man deeply connected to the system she has entered.

Their encounter inside enemy territory is expected to drive both the romance and suspense at the heart of the series.

Why tvN Released the Teaser on August 29

The timing of the teaser was one of the biggest reasons “100 Days of Deception” quickly gained attention.

August 29 is remembered in Korea as Gyeongsul National Humiliation Day, marking the 1910 loss of Korean sovereignty following Japan’s annexation of the Korean Empire. By releasing the drama’s first major teaser on that date, the production tied its promotional campaign directly to the historical period depicted in the series.

Korean viewers quickly noticed the significance. Online reactions praised the decision and expressed excitement over seeing a drama centered on resistance and espionage during the colonial era. Some viewers also said they hoped the series would attract international audiences.

The teaser also generated debate among some Japanese internet users, adding another layer of online discussion surrounding the drama before its premiere.

“100 Days of Deception” also boasts a high-profile production team.

Director Yoo In Shik, known for major Korean dramas including the “Dr. Romantic” series and “Extraordinary Attorney Woo,” is leading the project.

Director Kim Yoon Jin is joining him as co-director. The screenplay was written by Ryu Bo Ri, who previously received praise for the emotionally detailed storytelling of “Do You Like Brahms?” The combination of an espionage-heavy historical setting and a creative team known for character-driven dramas has increased expectations for the series.

Kim Yoo Jung and Park Jinyoung are joined by an extensive supporting cast.

The lineup includes Kim Hyun Joo, Lee Moo Saeng, Jin Sun Kyu, Lee Ki Young, Choi Deok Moon, Seo Jung Yeon, Kim Do Hyun and Kim In Kwon.

With several veteran actors involved, the drama is expected to build a broader political and historical world around its central spy mission. The production team has teased a fast-moving story in which viewers will have little time to predict what happens next as Ga Kyung takes her first steps as an undercover agent.

When Does ‘100 Days of Deception’ Premiere?

TvN’s “100 Days of Deception” is scheduled to premiere on October 10 at 9:10 p.m. KST.

The series will follow Kim Yoo Jung’s Lee Ga Kyung as she enters the Japanese Government-General under a false identity and becomes entangled with Park Jinyoung’s Kim Tae Woong.

With its politically charged historical backdrop, dangerous undercover mission and central romance, “100 Days of Deception” is already shaping up to be one of tvN’s most closely watched new dramas of the fall season.

Editor’s Insight

Historically South Korea’s relationship with Japan has been complicated. Up to this day the historical background creates tensions between the 2 countries as a recent series of events including actress Ha Young have been circulating the media. Korean citizens are very serious when it comes to people that helped Japan take over Korea in the past and also celebrate those who fought against Japan.