Their beautiful harmony was completed with IU's featuring vocals, which were delicate, yet powerful. In addition, Chanhyuk showed off a fun choreography, adding to the entertainment. IU, Suhyun, and Chanhyuk's performance was followed by a friendly conversation, where they revealed how their collaborative song was born. After their first encounter in 2014, it was revealed that AKMU had used their 'use IU' coupon that they had been offered. In addition, IU stated, "Thanks to AKMU, I was able to take part in a valuable challenge".
When IU asked about the message of 'NAKKA', Chanhyuk replied, "If you happen to fall in a place with no ground, it occurred to me that from the other side of Earth, it may look like you're flying back up. Overall, I wanted to include a hopeful story".
Meanwhile, following the release of AKMU's new collaboration album 'NEW EPISODE', "NAKKA (feat. IU)" has been quickly climbing the charts on various music sites.