The series marks the first time Shin Hye-sun and Lee Joon-hyuk have shared the screen since the 2017 crime thriller series Stranger.

Director Kim Jin-min considered casting the most crucial element of the production, emphasizing that Shin Hye-sun's ability to portray 'countless faces' was essential to capture her character's multifaceted nature.

Shin Hye-sun's preparation involved extensive styling with a wide array of wigs, contact lenses, and makeup to visually distinguish Sarah Kim's various aliases.

Director Kim Jin-min described the series as a 'timely' look at human ambition, and though the story is centered on the luxury industry, the production aimed to explore the fundamental value of identity rather than simple materialism.

Principal photography began in January 2025 and wrapped in late May of the same year, with filming taking place in the upscale Cheongdam-dong district of Seoul to authentically depict the high-fashion industry.

In the show, the staircase where Sarah Kim and Detective Park first meet is presented as belonging to the Seoul Metropolitan Police Agency, but it was actually filmed on the 66-step staircase of Kyonggi University's Seoul campus in Chungjeong-ro, Seodaemun-gu, which also served as the exterior of the police agency.

Lee Joon-hyuk was described as the 'audience's surrogate' and reportedly influenced the script's development by asking 'sharp, precise questions' during filming to help maintain the procedural's internal logic.

Amid a Korea–Southeast Asia cyber conflict, the show was hit by a wave of one-star review bombing from Indonesia on IMDb, yet ironically it still became a long-running number-one Netflix series in Indonesia.