Song Geu-rim (Kim So-hyun) has always wanted to become a radio writer. However, because she lacks the writing skills, she was always forced to be an assistant writer. When her only show faces cancellation, she must secure her place as a writer. So she decides to try casting Ji Soo-ho (Yoon Doo-joon), a top star actor who's known to have a "perfect life".
Yoon Doo-joon as Ji Soo-ho, a top actor who is accustomed to act based on scripts. He ends up becoming the DJ for a live radio show where nothing ever goes according to plan.[7]
Kim So-hyun as Song Geu-rim, the writer of Soo-ho's radio show with five years of experience as an assistant writer. She lacks writing skills but possesses excellent planning skills.[8][9]
Yoon Park as Lee Kang, the radio station's competent producing director. Because of his perfectionism, every program he handles achieved No. 1 in listener ratings.
Yura as Jin Tae-ri, an over-the-hill actress who fell from grace due to a DUI accident that happened three years ago.[10]
On January 24, 2018, a photo was shared online saying that lead actress Kim So-hyun was shooting underwater. The photo shows a woman wearing a hanbok in the water on January 21. On that day, the lowest temperature was recorded below −16 °C (3 °F). During the press conference for the premiere of Radio Romance held on January 25, the drama's PD addressed online criticism regarding the outdoor water filming, despite the weather warnings. He issued an apology stating that "Kim So Hyun's outdoor water filming wrapped up on Sunday (Jan 21st). We debated on it a lot, since she would be getting in the water. We ensured safety equipment nearby, as well as a camping car on set, and finished filming in the shortest amount of time possible. Due to time constraints, an action stunt double filmed additional outdoor water scenes yesterday (Jan 24th). It was filmed by an action actor, not Kim So-hyun, wearing a winter suit and shot in a similar situation (Jan 21st). The number of shots was done with one take and protection was taken right away. We apologize for causing concerns with this matter. The filming set is our life. Naturally, safety is important."[14] At the press conference, Kim's hand was seen red.[15]
^"'라디오 로맨스' 김소현, 영하 16°C 한파에 수중촬영?…PD "아냐" 해명" ['Radio Romance' So-Hyun Kim, underwater shooting at minus 16 °C cold? PD “No” Explanation]. The Dong-a Ilbo (in Korean). January 25, 2018. Retrieved January 4, 2020.
^Woo, Bin (January 1, 2019). [2018 KBS 연기대상] 유동근 대상 "장미희 덕분인데 내가 왜..대하드라마 부활 기원" [[2018 KBS Drama Awards] Donggeun Lee Grand Prize "Why am I ... thanks to Jang Mi-hee.]. Ten Asia (in Korean). Archived from the original on January 1, 2019. Retrieved January 1, 2019 – via Naver.
