This winter album from S.M. Entertainment, which has been out of production for 10 years, has made a successful comeback and has achieved the highest sales of any seasonal project released by the K-pop powerhouse.

'2021 Winter SMTown: SMCU Express' has sold more than 416,000 copies worldwide since its release on December 27, according to S.M. The album has sold more than 416,000 copies worldwide since its release on December 27.

Since the release of "2011 Winter SMTown: The Warmest Gift," the star-studded album from SMTOWN — which refers to the collective of artists affiliated with S.M. — has been the first special winter release.

Some of the most well-known K-pop artists signed to the label appeared on the album, including BoA, TVXQ, Super Junior, Girls' Generation-Oh!GG, Onew, Minho, and Key from SHINee, Kai from Exo, Red Velvet, NCT units, and Aespa.

The 10-song album includes not only songs from each of the groups but also some new collaborations between the groups.

S.M. conducted a multi-content project to promote the album, held a media art event on Thursday, and hosted a free online concert on Saturday to further promote the album.

A virtual world called SMCU, which stands for "S.M. Culture Universe," is a storyline that connects all S.M. artists through a single storyline.