It has officially been confirmed that Taiwanese actress Puff Kuo will taking the role originally given to Yoo In Na. While many believed the current issues surrounding THAAD is the cause for the change, CJ E&M stated otherwise, with, "Yoo In Na's schedules in Korea overlapped with the drama, as the filming kept getting delayed. She decided to depart after discussion with the producers."
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Meanwhile, Yoo In Na has already finished filming several episodes and even completed poster shooting.