Kim You Jung and Park Jinyoung Enter a Web of Secrets in ‘100 Days of Deception’ Teaser

Upcoming period spy romance “100 Days of Deception” has released a character teaser that places five people with competing motives inside the same dangerous political struggle. The drama stars Kim You Jung as Lee Ga Kyeong and Park Jinyoung as interpreter Kim Tae Woong, also known as Sato Hideo, with Kim Hyun Joo, Lee Moo Saeng, and Jin Sun Kyu completing the central ensemble. It will premiere on October 10 at 9:10 p.m. KST.

Set during the Japanese occupation of Korea, the story unfolds over a period of 100 days. Lee Ga Kyeong begins as Gyeongseong’s most skilled pickpocket before taking on a far more perilous role as an undercover agent for the independence movement. Her assignment brings her inside the Japanese Government-General of Korea, where every relationship can become either a route to information or a threat to her cover.

A bargain pulls Lee Ga Kyeong into espionage

The teaser establishes Ga Kyeong’s entry into the mission as a calculated exchange. She wants passage to America and offers to work as a spy in return, transforming a personal dream into the price of participation in a national struggle. Her new identity, Geum Seo Hee, lets her approach Hideo, but it also creates an emotional risk: the closer she gets to him, the more difficult it may become to separate strategy from genuine feeling.

Hideo works as an interpreter and occupies an uncertain position between languages, institutions, and identities. His connection to Sato Shinichi, the Director-General of Political Affairs, appears especially volatile. Hideo seeks recognition as Shinichi’s son, yet the older man responds with a weapon rather than acceptance. The confrontation suggests that family status and political power are intertwined, leaving Hideo vulnerable within the very structure he serves.

The teaser also reveals a romantic current between Ga Kyeong and Hideo. She approaches him while concealing who she is, and he appears to develop feelings for the woman he knows as Geum Seo Hee. An embrace in the rain gives the relationship a moment of warmth, but the surrounding espionage makes that intimacy unstable. Affection can expose Ga Kyeong’s mission, while Hideo’s own secrets may change what either person believes about the other.

Revenge and investigation widen the conflict

Kim Hyun Joo plays Yoo So Ran, a sniper attached to the anti-Japanese organization Gugukdan. Her objective is intensely personal as well as political: she has spent 13 years pursuing Shinichi and is finally within reach of the opportunity she has sought. The long duration of that pursuit positions her as a character shaped by patience, discipline, and unresolved loss.

Lee Moo Saeng appears as Yoo Philip, a Korean-American correspondent working in Korea. His professional role gives him a different route into the same network of secrets. Rather than relying on disguise or a rifle, he searches for truth through journalism, creating another form of pressure on people whose survival depends on controlling information.

Jin Sun Kyu portrays Shinichi, the official who links several of the teaser’s major tensions. He is So Ran’s target, Hideo’s feared father figure, and a senior authority inside the institution Ga Kyeong must infiltrate. By placing him at the intersection of revenge, family conflict, and espionage, the drama gives the five-character structure a clear center without revealing how much Shinichi understands about the threats around him.

A romance built on concealed identities

The teaser’s main dramatic engine is not simply whether Ga Kyeong can complete her mission. It is whether any of the five central characters can accurately read the intentions of the others before their own plans collapse. Ga Kyeong’s false name, Hideo’s divided identity, So Ran’s hidden vendetta, Philip’s investigation, and Shinichi’s authority create overlapping layers of deception.

Director Yoo In Shik, known for “Extraordinary Attorney Woo” and the “Dr. Romantic” series, leads the production. The new preview emphasizes suspense, romance, and character conflict rather than battlefield scale, suggesting that much of the danger will emerge through conversations, loyalties, and private decisions. When “100 Days of Deception” begins on October 10, its central question will be how long these carefully maintained identities can survive once love and revenge begin pulling the characters in opposite directions.