Actress Song Ji Hyo has reportedly joined tvN's weekend drama 100 Days of Deception as a surprise cast member, attracting attention after viewers noticed a familiar voice in the latest episode.

According to an exclusive report by SPOTV News on October 19, Song Ji Hyo is appearing in the drama starring Kim Yoo Jung and Park Jin Young. Her involvement had been kept under wraps, making her unexpected appearance a surprise for viewers.

The drama follows Lee Ga Kyung, played by Kim Yoo Jung, a skilled pickpocket who becomes a secret agent, and Sato Hideo, played by Park Jin Young, an elite interpreter working at the Japanese Government General's Office. Their paths cross during a dangerous 100-day espionage mission.

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During the fourth episode, which aired on October 18, viewers heard Song Ji Hyo's voice in a brief flashback scene. Although her face was not clearly shown, her voice and appearance from behind caught the attention of fans.

In the scene, her character was heard saying, "Did you get back safely?"

Some viewers quickly suspected that the mysterious woman was Song Ji Hyo, with comments such as "That sounds like Song Ji Hyo's voice" appearing after the broadcast.

Interestingly, Song Ji Hyo's name was not included in the episode's credits, suggesting that the production team had intentionally kept her participation a secret.

The actress is reportedly playing a character connected to Park Jin Young's role, with her identity and past expected to become important parts of the story. However, the drama has yet to fully reveal the character's background and significance.

When asked about Song Ji Hyo's casting, the production team gave a brief response, saying, "Please check through the broadcast."

The statement has added to the curiosity surrounding her role, as viewers look forward to learning more about her character in upcoming episodes.

Meanwhile, 100 Days of Deception continues to gain popularity through its rising viewership ratings.

According to Nielsen Korea, the drama premiered with a nationwide rating of 5.3%, increased to 7.6% in its second episode, and reached a new personal best of 9.0% with its fourth episode.

With the drama gaining momentum and Song Ji Hyo's unexpected casting drawing attention, viewers are now curious about how her character will contribute to the developing story.

100 Days of Deception airs every Saturday and Sunday at 9:10 PM KST on tvN.