After releasing a series of teasers, SM Entertainment's upcoming group ExO-K and EXO-M will be taking on a new stance with a prologue single to be released on January 30.

On January 27, SM announced that EXO-K and EXO-M's prologue single "What Is Love" will become available worldwide through online music websites including iTunes, Dosirak, Soribada, Naver and Bugs, as well as music websites in China.

The prologue single, to be released in Korean and Chinese versions, is a digital single and will act as an introduction to their official album. It will show new side of the group never before seen in the teasers and images that have been released until now.

So far, EXO has revealed its members Kai, Lu Han, Tao, Se Hun, Lay and Xiu Min.