Jaehyun of NCT is releasing the solo single “99 Degrees” online on Friday, label SM Entertainment said. He co-wrote the ballad tune that portrays discovering perfect love through 99 degrees of imperfection, slightly below the boiling point, adding his warm voice. A music video will support the single, and the trailer unveiled Thursday highlighted different sides of the idol, from the shining star on stage to a casual self rambling on streets. The single comes after his five-city solo fan concert