There are indeed many! Sun Yue used to be an art soldier, but Chen Kun was from the Oriental Song and Dance Troupe! They have all been exposed to music! People who became famous without studying include Dai Jun, a worker, Lu Yi, a child actor, Andy Lau, a former barber, and singer Jacky Cheung, who got his start at karaoke. Zhou Xun has never learned it

There are many more, mostly in Hong Kong!