tvN’s historical spy-romance drama 100 Days of Deception has recorded its highest viewership rating yet, continuing its upward trajectory following a dramatic sixth episode.
The series achieved an average nationwide rating of 9.5% on October 25, 2026, marking a new personal best and strengthening its position among the weekend’s most-watched television dramas.
According to Nielsen Korea, the sixth episode recorded a peak nationwide rating of 10.4%.
The result represented a significant three-percentage-point increase from the previous episode, which earned an average nationwide rating of 6.5%.
The drama also ranked No. 1 across all channels in its time slot, including terrestrial broadcasters.
It secured the top position among viewers aged 20 to 49 as well, an important demographic for tvN.
Since its premiere, 100 Days of Deception has steadily gained viewers.
The series began with a 5.3% nationwide rating for its first episode, and its latest result reflects growing interest in the story and its central characters.
The sixth episode appears to have played a particularly important role in the drama’s momentum, delivering major developments in the undercover mission and an emotional turning point for its female lead.
Kim Yoo Jung and Park Jin Young’s Characters Face a Turning Point
Set in 1930s Gyeongseong, 100 Days of Deception follows Lee Ga Kyung, portrayed by Kim Yoo Jung, a skilled pickpocket who becomes an undercover agent for the Korean independence movement.
Operating under a false identity, she infiltrates the Japanese Government-General of Korea, where she encounters Sato Hideo, played by Park Jin Young, an interpreter whose own responsibilities complicate their growing connection.
In episode six, Ga Kyung reconsiders her decision to abandon her secret-agent work after receiving another appeal from Yoo So Ran, played by Kim Hyun Joo.
She is ultimately given a new assignment: to gain Hideo’s trust while continuing to conceal her real identity and intentions.
Hideo, meanwhile, must also earn Ga Kyung’s confidence as he works to manage relations with the foreign press.
Their relationship becomes increasingly complicated as professional responsibilities and personal emotions begin to overlap.
The episode also brings the characters into a tense interrogation involving Geum Seok Joong, portrayed by Kam Woo Sung.
Ga Kyung and Hideo are summoned to interpret during the proceedings, creating an opportunity for Ga Kyung to communicate indirectly with Seok Joong.
She subtly conveys that So Ran is still alive, demonstrating her determination to protect her fellow agents while continuing to operate in dangerous circumstances.
However, the situation takes a devastating turn when Seok Joong is killed. Ga Kyung witnesses the aftermath and struggles to contain her grief, marking a significant departure from the emotional restraint she has maintained throughout her undercover mission.
Emotional Finale Leaves Viewers Anticipating What Comes Next
One of the episode’s most memorable moments arrives when Hideo notices Ga Kyung’s distress and attempts to comfort her.
Although she initially tries to hide her feelings, the accumulated pressure eventually overwhelms her.
The encounter signals a possible change in the relationship between the two characters.
Ga Kyung has been required to maintain a false identity and carefully manage her emotions, but the tragedy makes it increasingly difficult for her to keep her personal feelings separate from her mission.
Hideo’s response adds another layer to their complicated connection, leaving viewers wondering how their relationship will develop as the story progresses.
The drama’s combination of espionage, historical conflict and romance has helped distinguish it from other ongoing television series.
Its central premise places Ga Kyung in a dangerous position, where every interaction could affect both her mission and the people she hopes to protect.
With episode six delivering both a major plot development and a new emotional turning point, the series has given audiences further reasons to follow the unfolding story.
The latest ratings milestone also arrives early in the drama’s run, suggesting that its audience has continued to expand beyond its premiere.
Whether the series can maintain this momentum will become clearer as the consequences of Seok Joong’s death and Ga Kyung’s renewed assignment unfold in upcoming episodes.
For now, 100 Days of Deception has reached its strongest nationwide rating to date, with its October 25 broadcast earning 9.5% on average and peaking at 10.4%.
Its growing viewership, combined with the increasingly complicated dynamic between Kim Yoo Jung and Park Jin Young’s characters, has made the drama one to watch in the current K-drama lineup.
