Release Date: February 21, 2017

Contents of the package:
- 1 CD
- 1 Photo Book (96 pages)
- 1 Sticker
- 1 Photo Card (random out of 9 types)
- 1 Lyrics Book
- 1 Knock Knock Goods (random out of 9 types)

Track List:
- Knock Knock
- 녹아요
- TT
- 1 to 100
- Ponytail
- Jelly Jelly
- Pit-a-Pat
- Next Page
- One in a Million
- TT(TAK Remix) (CD ONLY)
- OOH-AHH하게(Inst.) (CD ONLY)
- CHEER UP(Inst.) (CD ONLY)
- TT(Inst.) (CD ONLY)

The album includes popular tracks like Knock Knock, TT, and One in a Million, along with instrumental versions of some songs.