A press conference and screening of INFINITE's movie documentary "GROW: Infinite's Real Youth Life" was held on December 1 at the CGV theaters in Wangsimni.

During the press conference, which was held after the screening of the movie, an unexpected event happened. Some fans of the K-pop group pretended to be members of the press and caused problem during the event, Enews reports.

The event organizers requested the fans who disguised themselves as reporters to leave the venue for the smooth flow of the schedule. However, some of the fans remained in the venue, disturbing members of the press in attendance.  

According to the news, the head of the movie's distributor requested them to leave or else it would affect the movie's upcoming premiere. "If you continue to act like this, we cannot premiere the movie, which is set to be released this week. Please leave the premises to continue the schedule smoothly," said the film's distribution company head.

The event's staff checked the business cards of the press in the venue, with the fake reporters eventually leaving.

"GROW: Infinite′s Real Youth Life" documents the K-pop group's world tour through 11 countries and 17 cities. It also includes never-before-told stories about the idols′ growth. The movie documentary will be released on December 4.

In other report, the group's newest subunit INFINITE F also debuted on December 1, through the MV release of "Heartbeat." Composed of L, Sungyeol, and Sungjong, the subgroup has already performed as a trio. In February, the three members performed "Heartbeat" in the group's February concert "One Great Step Returns." They also performed in INFINITE's "That Summer 2" series of concert in August.

In the music video, the boys prepare gifts for their special someone, showing how being in-love changes one's heart beat. The three were also shown riding a hot air balloon.

The song was used a theme song for the drama "High School: Love On," which starred Sungyeol and fellow INFINITE member Woohyun.

In the music video, the three boys are seen preparing sweet gifts for their other half, acting how an individual's heart beats nervously when in love. With excitement, they take off in a hot air balloon, as if taking off to a brand new beginning.

 INFINITE F's debut single album "Blue" will be released online on December 2 through local music sites, Koreaboo reports. According to Woollim Entertainment, the group's agency, "Three songs will be included in the album, while 'Heartbeat' is the title track. The group will also start promotional activities on music shows starting next week."

Meanwhile, it was recently confirmed that INFINITE will be performing in the upcoming "2014 Mnet Asian Music Awards" on Hong Kong on December 3.