People are confused how a Chinese couple managed to run a busy restaurant 21 hours a day without getting tired. Turns out the restaurant is run by two couples ? both the men and women are identical twins.Locals had nicknamed the eatery the robot couple restaurant as they couldnt understand how the same couple seemed to be on duty from 6am through to 3am. However, a journalist from Today Morning Post interviewed the restaurant owner and found out the truth. It turned out that the twin brothers, 32, married a set of twin sisters from the same township three years ago and moved to Yiwu to run the restaurant together. Many diners thought we worked too hard and are like robots, but they dont know that we are actually four people, said Mao Zhanghua, 32, the elder brother.