Wu Shen is a level 50 warrior trainer located in the Command Center in Old Town, in the human city of Stormwind. He and Shen Kang Cheng are the only remaining humans of East Asian ethnicity in the game, as far as can be surmised, after the removal of Woo Ping.
Stormwind is the pillar of the human race, maintained through strength of will and the edge of a sturdy blade.
I can tell just by the way you're standing that you're no warrior. Why don't you go do something safe, like read a book.