Demon hunter Chen Xuanzhang (Wen Zhang) believes that he can purify any demon through love. However, his belief is shaken when his attempt to defeat a demon fish ends in a family's death and a victory for violent demon hunter Duan (Shu Qi). After getting encouragement from his master, Xuanzhang soldiers on to hunting down a demonic hog with the help of Duan, who has fallen in love with Xuanzhang. Despite help from other demon hunters, the hog gets away. As a last resort, Xuanzhang and Duan turn to the help of Sun Wukong (Huang Bo), who has been imprisoned for five centuries for his crimes in heaven.
Tang Sanzang, an aspiring Buddhist hero tries to protect a village from three demons. He develops complex feelings for Miss Duan, the demon hunter who repeatedly helps him, and finally quests to meet the legendary Monkey King.