T.O.P (탑) is a recording artist and actor. His real name is Choi Seung-hyun (최승현). He the third member of the group Big Bang to release his own solo song (other being G-Dragon and Taeyang).
He is signed under YG Entertainment, but apparently he almost did not make the cut to be in Big Bang.
Choi was initially rejected by the record label, which deemed him too "chubby" to fit the "idealistic version" of an idol. Choi later stated that he "went home and exercised really hard because I wanted to join YG Entertainment." Six months later, he returned for another audition and was signed on.Monkey's, mimes, and checkerboard fashion in black and white make for a great video.
T.O.P has been spending most of his time trying to land jobs in television and movies. He has been in various dramas and films including I Am Sam, Iris, and 71: Into the Fire. Here is a clip of TOP from Iris.