Sung Si Kyung, Park Hyo Shin, Lee Seok Hoon, Seo In Guk, and VIXX, the artists under Jellyfish Entertainment, have released their winter project, 'Heart Project'!

The project is designed to get you into a festive mood for the holidays and to make it perfect for gift giving, it has been produced as a special gift set including the CD with the Christmas song "Because It's Christmas", as well as a 2013 calendar, photocards, music video and making DVD, and a poster.

Check out the music video for "Because It's Christmas" below!