2023–2024: First US tour, military service, Once in a BLUE MOON and Into You
On November 11, 2022, N.Flying announced that would hold a US tour titled "DWUW: Do What You Want" in 2023. From January 13 to January 22, 2023, they performed in six cities - New York, Chicago, San Juan, Atlanta, Houston and Los Angeles. They later added concert dates under the same title in Taipei and Macau, which were held on April 15 and 23 respectively.
On February 2, 2023, FNC Entertainment confirmed that Cha Hun would enlist in the military on March 20, 2023. After completing basic training, he would be sent to the Army Military Music Unit. On March 24, the agency stated on their official fan cafe that Seo Dong-sung would enlist on May 8, 2023. On April 6, FNC Entertainment announced that Kim Jae-hyun would enlist in the military on May 25 and undergo basic military training before serving as a public service worker.
On May 20, 2023, in honour of their 8th anniversary, N.Flying released a digital single album titled "Once in a BLUE MOON" containing two tracks, "Blue Moon" and "Tree".
On May 26, 2023, FNC announced that the remaining two active members, Lee Seung-hyub and Yoo Hwe-seung, would go on tour. The first concert of their "FOREST OF 2RAVELERS" tour was held in Hong Kong on June 24.
On June 25, N.Flying released a new digital single entitled "Into You". The song first made its appearance in the "2024 N.Flying Live Hide-Out" concert before the official release.
On September 19, 2024, Cha Hun was discharged from his mandatory military service.
On November 7, 2024, Dongsung was discharged from his mandatory military service.
