At the height of Tang dynasty, a young man named Di Ren Jie went to the capital to take an imperial examination. During the test, he stopped an assassination attempt against Empress Wu's life. Seeing his bravery and quick thinking, the empress ordered him to investigate the incident.

• Bosco Wong Chung-Chak
• Qi Wei
• Ma Tianyu
• Ruby Lin
• Yuan Hong
• Xiaoxiao Sun
• Wu Jinyan
• Janice Wu