For the first time Billboard began ranking the top K-pop songs of the year, Red Velvet is the first female act to be named for the year's best song.

The brainchild of Grammy winners The Stereotypes, Maxx Song, Whitney Phillips

and K-pop behemoth songwriter Yoo Young Jin, the alt R&B smoothness of “Bad Boy”

undeniably proved to be the group’s -- and one of the year’s -- most pristine production to date.

Following the opening query of, "Who dat, who dat boy?"

the song grooves along as it opens up to its titillating trap beats,

coyish hums and echoing “ooh”s as they envelope Red Velvet’s layered, harmonious vocals.

After the song’s release, it rapidly became a fan favorite.

and was eventually remade into an English version.

The group has since turned back to their brighter orientation with the summer hit

“Power UP” and November’s shriek-fest in the form of sequel “RBB (Really Bad Boy),” but the year undeniably belongs to the sultry perfection of “Bad Boy.” TH