There are 8 people in the team because Mu Fangcheng (M) is also a part of the group, but not a core member.

According to the Himalayan novel platform, the core members of this group are only seven, and the code name of the members is S.T.A.L.K.E.R

Among them, s is the leader. These seven letters stand for scavenger, adventurer, lone ranger, killer, explorer and robber respectively.

The members of this group include: (S), (T), (A), (R), (L), Xin Jia (E) and Xu (K). Mu Fangcheng (M) is a part of the group, but not a core member.

Therefore, although there are actually eight members, because there are only seven core members, it is called the Group of Seven. This group appeared in the novel Beauty for Stuffing and was founded by Sibai Xu's father.