Pei Ying comes from a luxurious family. Her mother was lost to illness when she was little, and ever since she stayed close with her father, who is a clan lord running the Butterfly Clan. She was her father's favorite, in which spawned the envy of her brother. Her father is very protective of her. Hoping that one day she will marry a cable man and lead on the family's legacy.

Her father wanted her to pass down the family's tradition called Butterfly Sword Style, but she preferred to fight using rope dart instead. She acts just like a typical rogue princess.