The band embarked on the CNBLUE 5th Anniversary Arena Tour 2016 "Our Glory Days" throughout November in Chiba, Osaka, Aichi, Fukuoka, and Tokyo.

CNBLUE announced Euphoria as its fifth studio album on the September 5, 2016 broadcast of Abema TV's Fresh!, with a release date of October 19.

[1] The date marks the five-year anniversary since the band's major-label debut in Japan with "In My Head".

[4] The song revolves around the battle royals depicted in the professional wrestling organization WWE.

In response, Jung stated: "When you listen to positive music, it makes you feel good, right?

[9][10] The music video for "Glory Days" was uploaded on CNBLUE's YouTube channel on September 12.

[14] Euphoria sold 26,401 copies in its first day of release and ranked number one on the daily Oricon Albums Chart.