On November 11, 2021, Stray Kids dropped a mysterious poster, titled
Christmas EveL without knowing the format. The poster features a horrible, slightly off-smiley face in black, and a blood-like red background, showing 2 torn papers, the one features the red-font "Christmas Eve", and the one writes the "L" in flowing ink, as well as a release date: 2021.11.29. Marketed as the group's "holiday special single", previewing and pre-orders for the limited version of the
CD began on the same day, and the standard version began on November 15. The group announced that they would not promote the songs on any
music program, as a gift to their fans who have sent warm support and love in 2021. The second expresses the members tying a bow on their necks and wearing
Christmas-themed outfits, surrounded by wrapped presents and a Christmas tree in the background. The official track listing was posted on November 19, serving "
Christmas EveL" and "
Winter Falls" as a double
lead single on the record. while "Winter Falls" was released on November 22 and 28. A snippet video called "unveil: track" of "24 to 25" was uploaded on November 25, as well as the title track "Christmas EveL" via
Instagram Reels on November 27. An accompanying music video for "Christmas EveL" was premiered alongside the single album release, "Winter Falls" the next day, and "24 to 25" on December 6. Although there is no promotion at the music shows, "Winter Falls" was given a debut performance at 2021
SBS Gayo Daejeon on December 25, alongside "
Thunderous", arranged in the Christmas version. The next year, they performed "24 to 25", and "Christmas EveL" at its
2022 edition of the same program. ==Critical reception==