Main Casts
Yoon Doo-joon as Ji Soo-ho
Nam Da-reum as young Ji Soo-ho -A top actor who is accustomed to act based on scripts. He ends up becoming a DJ for a live radio show where nothing ever goes according to plan.
Kim So-hyun as Song Geu-rim
Lee Re as young Song Geu-rim - The writer of Soo-ho's radio show with five-year experience as an assistant writer. She lacks of writing skills but possesses excellent planning skills.
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 happened three years ago.
