On January 26, 2015, subunit Infinite H made their comeback after two years with the release of their second EP, Fly Again. They also held a press conference and a showcase on the same day at AX Korea, in Seoul. Promotions for the album started on January 31, on M! Countdown and Music Bank.
On January 24, Infinite teased fans with the official trailer for their Dilemma Tour. The tour commenced on February 1 in Fukoka, with planned concerts in Tokyo, Osaka and Aichi.
In May, Sung-kyu released his second solo album "27." The whole album is produced by Sung-kyu's respected artist Kim Jong Wan, the frontman of the indie rock band Nell. He promoted with double title tracks and was released on May 11 along with the music video for "The Answer" and "Kontrol".
On June 30, Infinite released comeback teaser photos for the release of new mini album Reality. On July 2, they announced that the track Bad would be the title song from Reality, the first music video teaser appeared on July 6 the song itself together with its video was released on July 12, with the release of Reality following on July 13.
Best HD Wallpapers of Infinite Kpop Star 2015
On July 21, Infinite released their teaser for Infinite Effect World Tour. Holding a flag with an infinity logo, leader Sung-kyu leads his fellow members through the doors, signaling their invasion into other countries through the teaser video. With the use of fire in the background, tarot cards, coffins, and zombie face makeup, Infinite seems to be going with a dark concept, which has been a strength for the group for their promotions.
"Infinite Effect" will be the group’s second world tour since their first (One Great Step) held in 2013. The tour started in Seoul although the other stops outside of the country have yet to be announced.