yes, many Korean singers are good dancer and have good voice.
Chae Yeon's dancing is of her own style. You may check out for the music video of 오직 너, the title song of her 3rd album and you will see her dancing similar to that performed in Love Letter or X-man.
2007-02-17 16:57:39 補充:
3rd album released on 18.11.2005track 1. 오직 너 只有你