Group SF9 has released a listening guide for their 2nd full album 'TENACITY' through their agency FNC Entertainment. The guide features direct commentary from members on all tracks, including the title track 'Without Wings,' offering their personal listening points. Members described the title track as having "a heavy beat and rhythmic percussion in harmony, along with an addictive melody," noting that it "sensually captures the group's unique vocal charm while maintaining an energetic mood." Released on the occasion of their 10th debut anniversary, the album tells a story of reflecting on the past and moving forward once more. SF9 will release their 2nd full album 'TENACITY' on the 26th with a showcase performance, followed by concerts scheduled for October 10-11 in Seoul.