Shuqin Zhang (張書勤 Zhāng Shūqín) is the aide of Yuanda Zhu.
Ryo Hazuki first meets him after setting up a Chawan Sign at the Dou Jiang Diner. Zhang, unseen, gives Ryo a note stating to meet at the diner at 8pm. At 8pm Zhang enters the diner; shortly after appearing, Yuan and the Yellow Heads break in and capture him. Ryo fights off the men and rescues Zhang. Zhang reveals that he has no idea about Zhu's current whereabouts as he has hidden himself from the Chi You Men. However, Zhang tells Ryo to seek "Ren of Heavens".
Later on, Zhang follows Ryo to Kowloon to help in their investigations on Yuanda Zhu. However, because of his connection with Zhu, he gets captured again by Yuan, leading Ryo and Ren to rescue him.
- Zhang's zodiac sign is Scorpio and he has a A blood type.