Sun Yangyang is a Chinese swimmer who was born on December 1, 1991 in Hangzhou, Zhejiang Province. He is one of the most successful swimmers in Chinese history and has won numerous medals at both the Olympic and World Championship levels.

Sun first gained international attention at the 2010 Asian Games, where he won three gold medals and set a new Asian record in the 1500m freestyle. Since then, he has gone on to win multiple gold medals at the Olympics and World Championships, including breaking his own world record in the 1500m freestyle at the 2012 London Olympics.

In addition to his success in the pool, Sun has also been involved in controversy. In 2014, he served a three-month suspension for doping violations. He was also involved in a highly publicized altercation with Australian swimmer Mack Horton at the 2016 Rio Olympics.

Despite these controversies, Sun remains a dominant force in the world of swimming and is widely regarded as one of China's greatest athletes.