The Book of Us: Entropy
| Grupo | 데이식스 |
|---|---|
| Lanzamiento | 2019-10-22 |
| Tipo | full |
| Canción principal | - |
The Book of Us: Entropy is a full-length studio album by the K-pop group Day6, released on October 22, 2019. Day6 debuted on September 7, 2015 under JYP Entertainment.