After winning the 'K-Chart' with "Keep Your Head Down" on yesterday's "Music Bank", the duo have returned for today's episode of "Music Core"! The two left messages on their homepages yesterday and expressed their joy by writing, "We'd like to deliver our gratitude and this trophy for all of the fans and staff members that have trusted in us for the past two years and three months~ We'll be working even harder from here on out, so please watch over us~" Changmin added, "We'd like to thank our fans first!! We're able to smile happily because of all of the unchanging support you guys gave us. ^^  It's only been a week into our promotions, and we'll be working hard to show better and improved sides of us! Thank you, Cassiopeia." Check out their performance below! Source: Newsen