The spy romance K-drama "One Hundred Days of Lies," starring Kim Yoo-jung (김유정) and Park Jin-young (박진영), has generated continuous buzz and steadily rising viewership since its premiere. On October 1, surprising news broke that actress Song Ji-hyo (송지효) has officially joined the cast. According to an October 19 report by Korean media outlet SPOTV News, Song will portray the missing adoptive mother of Sato Hideo (佐藤英夫), the character played by Park Jin-young. The production team had kept her involvement a secret, and it was only after the latest episode aired that sharp-eyed viewers noticed her voice and silhouette, making this "hidden cast member" an unexpected hot topic.
Set in Gyeongseong (경성), the former name for Seoul, during the Japanese colonial period, "One Hundred Days of Lies" tells the story of Lee Ga-kyung (이 가경), Gyeongseong's top pickpocket who becomes a spy (played by Kim Yoo-jung), and Sato Hideo (佐藤英雄), an elite translator for the Japanese Government-General of Korea (played by Park Jin-young). Their paths cross in enemy territory, leading to a 100-day spy romance.
In episode 4, which aired on October 18, a woman's silhouette appeared as Sato Hideo recalled his adoptive mother, accompanied by the line, "Did you return safely?" Although the scene did not directly reveal the character's identity, many sharp-eared viewers immediately found the voice familiar, speculating, "It sounds a lot like Song Ji-hyo's voice!" Now that her casting is confirmed, viewers' suspicions have been validated.
In the drama, Sato Hideo's adoptive mother has always been a mysterious key figure. She is the Korean wife of Sato Shin-ichi (陳善圭), who gave birth to a daughter before suddenly disappearing one day. Sato Hideo, who became Sato Shin-ichi's adopted son, had confided in her in the past and considered her an important family member. Therefore, even if he has to hide it from his father, he plans to go to Korea to search for his adoptive mother.
Furthermore, a wallet receipt that previously intersected with the female lead Lee Ga-kyung has now been revealed to be connected to the adoptive mother's whereabouts, adding more suspense to this hidden subplot.
Although Song Ji-hyo's character is believed to hold important plot clues, the story has not yet officially revealed her identity or past. With the news of her casting now public, there is considerable anticipation for future episodes to further unravel the mystery of Sato Hideo's adoptive mother's disappearance and reveal her relationships with other characters.
Regarding Song Ji-hyo's surprise appearance, the production team of "One Hundred Days of Lies" told SPOTV News, "Please confirm through the broadcast content," without revealing further details. Even the actor credits for episode 4 deliberately omitted her name, highlighting the level of secrecy and further piquing viewers' curiosity about what kind of surprising performance this hidden cast member will deliver next.
Meanwhile, "One Hundred Days of Lies" has seen a continuous rise in viewership recently. The first episode recorded a rating of 5.3%, which sharply increased to 7.6% by the second episode. Episode 4, driven by Kim Yoo-jung's exquisite acting, achieved a rating of 9.0%, demonstrating strong upward momentum.
As the drama's reputation grows, viewership is approaching the 10% mark. Now, with Song Ji-hyo's surprise addition as a hidden cast member, how the subsequent plot will unfold has become a major focus of audience attention.
