On October 14, SBS released the music video for Part One of the soundtrack for “Secret Door,” featuring a song by hip hop group Block B of the same name. The strong features a foundation of string instrumentals, making for a fusion hip hop track for the historical drama. The lyrics were co-written by Block B member P.O.
The music video features scene after intense scene depicting the relationship between Crown Prince Sado (Lee Je Hoon) and his father King Yeongjo (Han Seok Kyu), somewhat strange at first being coupled with a hip hop track, but fitting at the same time.
Listen to the song below: