After pushing back his debut date due to a hand injury, SS501's Heo Young Saeng finally announced that he'll release his mini-album on May 12th! His agency had a lot of worries over his slow recovery, but Heo Young Saeng himself decided it was best to have a comeback soon. Heo Young Saeng's hand is not quite at 100% yet, but he's passionately preparing for his comeback stage. He has also released his video teaser on the 4th, as well as some stills from his solo MV. Meanwhile, it's been revealed that 4minute's HyunA participated in the title song "Let It Go", and fellow SS501 member Kim Kyu Jong also worked on another song in the album. Source: Sports Chosun via Nate