As you may know, Ten just recently was a dance mentor and judge on a Chinese dance competition show for several months in China, which is where "Birthday" and a version of this dance was first performed. And yes, this dance was, at least in part, choreographed by him. He is often the one that creates or modifies the most memorable and dynamic parts of NCT/WayV's dances that he is a part of. Most choreographers say they present Ten with choreography and then he changes it and makes it even better. He is a very skilled choreographer as well, which, as you have seen, he has shown off in several self-choreographed performances on NCT's RU-vid channels and as a member of SuperM, etc.
My beautiful person TENLEE. Please everyone stream MV BIRTHDAY by Ten on RU-vid and DON'T FORGET to listen to music on Spotify. Give him 100 M viewers and listeners
