N.Flying has released individual concept photos for the second installment of their monthly 'Fly High Project' music series!

To match the theme of the upcoming single, entitled "Rooftop," the boys are posing for individual photos on the roof of a building in both daytime and at night. Following the departure of group bassist Kwon Kwang Jin, the release will be the first time the group will be promoting as four.

Meanwhile, "Rooftop" is set for release on January 2 at 6 PM KST.

Check out the concept photos below!