The Book of Us: Gravity
The Book of Us: Gravity is the fifth extended play by South Korean band Day6. It was released by JYP Entertainment on July 15, 2019. Background and release. Following the end of Day6's second fan meeting in Seoul, a prologue film entitled "The Book of Us" was released on YouTube on June 30 at midnight (KST). The EP was announced the following day with "Gravity" marking the beginning of the new era following the end of the "Youth" series in 2018. Pre-orders for the physical album opened on July 1, it will be  available in two versions: "Soul" and "Mate". The track list, which contains six new tracks, was released on July 3. All members except Dowoon participated in the composition on the songs. Young K wrote all the lyrics himself except for "Cover" which he co-wrote with bandmate Sungjin. On July 5, individual "artwork images" were released every 15 minutes from midnight to 1:00 AM. Details on the physical album were revealed later that morning. Individual teaser images were released from July 6–10, followed by a group teaser image on July 11. The first music video teaser for the lead single  Time of Our Life was released on July 12 and an album sampler was revealed the following day. The EP was released on July 15 along with the music video for "Time of Our Life". Promotions. Day6 held a "Comeback Live Talk" on July 15 on Naver's "V LIVE" broadcasting site. They held their comeback stage on Mnet's "M Countdown" on July 18 and promoted "Time of Our Life" on several music programs in South Korea, including "Music Bank", "Show! Music Core" and "Inkigayo". The band promoted their new EP during their second world tour, starting in Seoul  on August 9, 2019. Track listing. Adapted from the group's official website.