Even of Day is a South Korean pop sub-unit formed from the original band Day6 under JYP Entertainment, consisting of members Young K, Wonpil, and Dowoon. The group emerged after Day6's album The Book of Us: The Demon and a hiatus due to the mental health issues of other members. Even of Day's debut EP, The Book of Us: Gluon, was well-received, reaching number 3 on the Circle Albums Chart. They released the single "So, This Is Love" in 2021, followed by their second EP, Right Through Me, which also peaked at number 3 on South Korean charts. The group further engaged with fans through online concerts and music videos, showcasing their evolving musical journey.