Cai Xukun’s band music is called Just Because You Are So Beautiful. On December 2, 2016, the third single of SWIN-S's first mini album "New World" "Just Because You Are So Beautiful" was released online. The highly addictive fashionable electronic music melody blends Hiphop, the big boy of SWIN-S They all made a strong confession together, with charming voices and sultry songs. The whole song was filled with the aura of youthful hormones that are ready to stir up.