The song "Who Are You" is the theme song to Jang Na Ra's character for the show as she works with Seo In Guk for an investigation in the drama. It's a song that shows her heart changing towards Seo In Guk as she works more and more with him.
The staff revealed, "Kim Ye Rim recorded the song without a single break. In the middle we suggested she take a break, but she said she was focused on the song and asked to continue. Even though she's young, she showed off an expertise in understanding the song and focus."
Check out the song above!
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