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Jang Young-Sil (Gang Ye-Won) barely lands a job at the NSA (National Security Agency). She is hired as a contract worker to write positive comments for the NSA. Na Jung-An (Han Chae-Ah) is a detective who often uses foul language. They carry out an infiltration operation to recover money that was stolen from her boss in a voice phishing scheme.

Set in the 1990's, Park Ha Kyung teaches Korean literature at a high school. To escape her ordinary days, Park Ha Kyung decides to take one day trips on Saturdays. During her one day trip, she walks around, eats different foods, and meets various people. She realizes she receives comfort and empathy through her travels.