Since he was a child, Kang Dokyung has been able to see an eeire black smoke that caused people to get hurt. One day, he runs into a man covered in this smoke, who turns out to be his infamous school sunbae Park Woohyun. Though wary of his cold demeanor at first, Dokyung is surprised to find out that whenever he touches Woohyun, the smoke disappears. Ecstatic to finally use his special gift for some good, Dokyung is determined to help his sunbae to get rid of the darkness surrounding him.