Earlier today, newly formed hybrid duo H2 released their first digital single Heart Attack and has already stirred up quite the buzz. Now they make their live stage debut with their title track on Music Bank. Rapper H-Eugene made a bold step when he decided to make his comeback under a duo. He definitely surprised everyone when he revealed that his counterpart would be female vocalist Han Soo Yeon. Watch below as these two "H" factors join forces and deliver a raw performance so powerful and filled with emotion that it'll give you a heart attack. Their music video was also released today. http://www.youtube.com/watch?v=yrKdFJqVAP8