Also known as Fourth Young Master Cao, he is twenty years old and a suspect in the murder case. He is Liu Pei'er's fiancé. He has an empty household compared to other younger men in the Cao family who have concubines or betrothals. His previous two fiancées broke off engagements. He moved to Shanyang County six months ago and stays at the Cao family manor outside the city. Rumored by a constable to possibly be a eunuch.
