"There were initial discussions about including the song in the film score, but negotiations stopped so we were under the impression that it wasn't happening," said the press release. "It was only after the film was released that we became aware of the song's unauthorized use, without taking the appropriate and necessary steps to complete a contract with the artists."
"The artists were also hesitant about authorizing the use of the music, as the film is a very sensitive topic in Korea, so they are very surprised," said a spokesperson for FeelGhoodMusic.
The rep said it will take legal action against DFSB, an agency that handled talks with Sony Pictures regarding the use of the music.
Tiger JK and Yoon are both pioneering hip-hop icons in Korea that are credited with introducing the genre in the country in the 1990s. The two married in 2007 and have a son.
This article originally appeared in THR.com.