[1] On December 7, another teaser was released, revealing three different letters, 'F', 'R' and 'B' and subsequently represented the last two artists to participate in the project, namely Red Velvet and BoA.

"Christmas Paradise" was recorded by South Korean singer BoA and released as the third and final single from the project on December 22.

The song is an R&B-tinged track that "relays a romantic and warm" feeling, while expressing a "happy and cozy" Christmas with a beloved one.

SM Entertainment released teasers of the songs through their video sharing application, Everyshot.

The four girls discussed their groups' activities in the past year and promoted the singles, including BoA's.