Kyuhyun's mood ring had been gray since he broke up with Sungmin.  It has been a year now so he thought his mood ring was broken.  Then he met up with his university dongsaeng, Suho, and regained their friendship back.  After spending more time together, Kyuhyun's mood ring finally started to change its color after being gray for so long.  Suho was able to bring back the color to not only the mood ring but also in Kyuhyun's life.