Three years ago, Zhou Mingyuan, the richest man in Jiangcheng, was stabbed through the heart with a sharp instrument in the study room of his villa and died on the spot. There were six people in the villa at the time of the incident - Zhou Mingyuan's wife, son, housekeeper, personal doctor, driver, and a business partner who was visiting temporarily. Six people all said they saw the killer, but each gave a different account.
Some people said it was a middle-aged man wearing a black trench coat. Some said it was a masked young woman. Some people say that two people were arguing. Others said they didn't see anything and only heard a muffled sound.
