According to track 13 "What's Next?" from Unlimited, the main origin of this album should be Jazz in American style.
The melody of the track "待續" (To be Continued...) from F.I.R.-Fairyland in Reality became the introductory melody of track "無限" (Unlimited) from Unlimited. But this album did not use the melody of "What's next?" from Unlimited.
The song that "What's next?" announced is the song of track 8 "1234567".
The piano version of "Every Day And Night (天天夜夜)" is at hidden track of Track 11.