• The film is a spin-off of a Japanese TV drama from 2018
  • BTS' Jungkook and Black Number's vocalist Iyori Shimizu produced the OST
  • "Signal" will be out in Japan on April 2

South Korean boy band BTS's new track, titled "Film Out," had been confirmed as the official soundtrack for the upcoming Japanese movie "Signal."

The movie's teaser featuring the new song was released on Tuesday. The film is a spin-off of a 2018 Japanese TV drama of the same name. It was previously adopted from the original Korean drama series produced by tvN in 2016.

BTS and Japanese rock band Back Number collaborated for the original soundtrack of "Film Out." The song is said to be an emotional ballad. BTS member Jungkook and Black Number's vocalist Iyori Shimizu composed the lyrics and created the melody for the track. The duo also produced the song.

"'Film Out' is a song that we made together with Shimizu and after we received the demo we were captured by the melody. The melody and the lyrics express an emotional pop ballad genre. We think this song will move many people’s hearts," the BTS members said.

The K-pop septet also released the OST for the drama version of the movie in 2018. The song was titled "Don't Leave Me."

Following the release of the 90-second teaser, "Producer JK" and "PROD JK" began to trend on Twitter as fans were delighted to hear about the new song produced by the Golden Maknae.

Here's what fans had to say about the new song:

"Wow Jungkook proud of you this is insane I want to listen the full ver of this song hope it will release soon."

"Am I ready for another masterpiece?? absolutely not!!"

"I'm so excited now, Jungkook here with another beautiful song and get to hear BTS sing is just incredible news."

"Nah hold up!! Gimme a second, another Japanese ost I might start crying right now."

"Can't wait to hear the OST!"

"I've been doing praying circles since 2018 for a rock song! I'm so excited."

The movie "Signal" is scheduled to release in Japan on April 2.

Meanwhile, BTS will be performing on the American television series "MTV Unplugged." The one-hour-long special show featuring the K-pop band is set to air on Feb. 24.

BTS Band
Musical group BTS attends the Billboard Music Awards at MGM Grand Garden Arena on May 20, 2018, in Las Vegas. Getty Images/Frazer Harrison