Mu Feiyan is the Patriarch of the Mu Family and Yun Che's grandfather from his mother side. He has a good relationship with Yun Qinghong who married his only daughter, Mu Yurou. He constantly gets angry at his three sons who all have yet to be married and cannot give him an heir. Many times he would become so enraged that he would beat up all three but they still refused to get married.
He has black hair, a long black beard, and an authoritative look.
He has a bold and unyielding personality.