ToHeart-Prologue

I'm not really sure what this means but I'm going to post about it. Key and Woohyun, folks. Playing with firework-sparkler-things. So Key if from SMTOWN and Woohyun is from Wolliment... Did they beg their agencies to let them do something together? Are we going to get a song with the two of them, cause that would be awesome. Or is this a style line? I'm confused but I'll keep my eyes open. I hope it's a song. Either way, the video is super cute, lots of fun,  and I love how Key and Woohyun are such good friends. :) WooKey, fighting!