Kim Sohee, daughter of the pack's leader celebrates her birthday and everyone is invited. The 21st borthday is supposed to be a happy day for young wolves. They're supposed to find their mate on that day. But for you it doesn't turn out to be all rosey..

Park Chanyeol, a lost child. He was fished out of the river by a young Sohee, beaten and unconcious. Will he find out what happened in his past? His black fur is rare and many wolves are scared of it: it's said to give its owner special strength. The born leader.