The duo members, Brian and Hwanhee, thanked fans for their continuous support as they took a snapshot with a large blue and white anniversary cake, commemorating the special occasion.

SEE ALSO: [MV & Album Review] Fly to the Sky – 'I'

H2 Media Entertainment also shared a special video featuring Fly to the Sky's top 5 tracks, allowing fans to go on a nostalgic trip in light of their upcoming concert.

Meanwhile, the duo recently returned with their 2nd mini album 'Your Season'.

Congratulations on 18 years!