Now into February, take a look at the K-pop artist collaborations that had us dancing and singing through the start of 2015.

"Star Warz" - Outsider and Twista
Released: January 8

World-famous Korean speed rapper Outsider made a triumphant comeback last month with this "battle-style" rap track collaboration with American hip-hop artist Twista. The two are among the fastest rappers in the world.

"Checkmate" - Jung Yong Hwa and JJ Lin
Released: January 30

CNBLUE lead singer Jung Yong Hwa released his first solo album in January and featured a handful of talented artists. Among them, Taiwan-based Singaporean singer JJ Lin.

"Coach Me" - San E, Hyolyn (of SISTAR), and Joo Heon
Released: January 2

Rapper San E kicked off 2015 with another successful collaboration single, this time working with SISTAR member Hyolyn and NO.MERCY contestant Joo Heon. His duet with After School's Raina, "A Midsummer Night's Sweetness," was one of the most popular singles last year.

"Fire" - Mad Clown with Jinsil (of Mad Soul Child)
Released: January 9

Rapper Mad Clown dropped his third EP, Piece of Mine, at the start of the year using his collaboration with Mad Soul Child singer Jinsil as his lead single. The two definitely don't disappoint.

"Pillow" - Giriboy, Soyou (of SISTAR), Ki Hyeon
Released: January 15

Another collaboration featuring a NO.MERCY contestant. This time frequent collaborators Soyou (whose duet "Some" with JungGiGo was one of 2014's biggest hits) and Giriboy team up with newbie Ki Hyeon for the catch tune.

What was your favorite K-pop collaboration from January? Did we forget anyone? Let us know in the comments section at the bottom of the page!