SF9 has released a video of the making of their 2nd full-length album ‘TENACITY’. The video shows the recording site of the title song ‘Without Wings’ and the process of the members adding their ideas to complete the song. During choreography practice, we checked the stage repeatedly, carefully matching the movements and hand gestures. SF9 shared with fans the process they prepared for a high-quality performance worthy of their 10th anniversary album.