On June 23, rapper DinDin joined the YouTube channel 'Seungwoo's Dad' (literal translation of '승우아빠') in order to cook some rose spicy rice cakes.

After they finished cooking and tasting their dish, the YouTube channel host asked rapper DinDin to share the behind story of how he came to sing 'Must Be the Money', the OST for the hit drama 'Section Chief Kim' (2017). DinDin replied, "Around that time, I was the Korean ambassador for the film 'Fast and Furious: The Extreme' and had gone to America to interview Vin Diesel. But two days before I returned to Korea, I was told by my company that I had to participate in an OST for a drama. When I asked when I had to record the song, they told me I had to do it as soon as I arrived in Korea. I didn't even have any lyrics prepared, and when I asked to hear the soundtrack, it wasn't my style."

He continued, "At that time, I still had pride in hip hop. So I took some time to think about it. I then quickly wrote the lyrics and recorded the song as soon as I got off the plane, and the song was released on the aired episode that same week."

DinDin further revealed that while his initial pride as a hip hop rapper led him to avoid actively promoting the song, the unexpected love his song received changed his mind. DinDin stated, "I didn't want to promote [the song] because I didn't want it to be known to many people. But then, I was asked to perform a celebratory performance at the KBS Drama Awards Ceremony. With that stage, I beat the New Year’s Eve bell in real-time search terms, and [my performance] was the number one searched term. I now think of it as my representative song because it has received a lot of love from people".