Lang (also known as the House of Lang) is a family name that may refer to the following individuals from Zheng Fa: * Lang Zi - a philosopher from Zheng Fa who was known for his "philosophy of detainment" and his many sayings. * Dai-Long Lang - a well-known detective in Zheng Fa who was the former head of the family and the father of Shi-Long Lang. Died after failing to solve the SS-5 Incident. * Shi-Long Lang - a skilled Interpol agent with an "arrest first ask questions later" attitude.