Xing Cai is the daughter of Zhang Fei. Her mother is the niece of Xiahou Ba. Wanting to protect her homeland, she decides to join the Shu army. She starts as a novice at the battle of Cheng Du and is taught how to fight by warriors matching the might of her father. She learns quickly and is compared to another young warrior who also grew in ranks, Guan Ping. Her vigor in battle earns Zhuge Liang and Liu Bei's trust. Once her father, Guan Yu and Guan Ping lose their lives at Fan Castle, she is entrusted to guard Liu Bei at Yi Ling. By then, she is seen as an accomplished warrior and her lord gives her his final wish to safely guard Liu Shan. With the future of her home on her shoulders, she is one of the last hopes for Shu against Wei and Wu. At the battle of Bai Di Castle, Xing Cai fiercely guards the castle's southern gate along with Zhang Bao. In her ending, she continues to serve Liu Shan and acts as his personal training instructor.