“Heartbeat” (also known as “My Heart Is Beating”) has dropped another teaser! KBS 2TV’s upcoming fantasy romance drama “Heartbeat” stars 2PM’s Taecyeon as Seon Woo Hyul, who is half-human and half-vampire. Although he desperately wants to become human, he misses his chance because of one fateful day out of 100 years. He eventually winds up moving in