These are the events that took place within the base before Ximen Xueya and his husband had returned to the Z District Base. It was the scene when the original Su Liye had just returned from a mission and killed the bastard that used his family members as bait. The ending of that black-hearted policeman and his mercenary group is to become the zombies' meal after Su Liye and his two subordinates took their leave with the seeds from their mission.
Their return had caused a commotion in the base. After all, the whole mercenary lead by Liu Ling never returned and among the mission takers for bringing back the seeds, only three people had returned. Only Su Liye and a married couple, who worked for him. The soldiers guarding the entrance were frightened when they opened the gates to the base and met Su Liye in an extremely bad mood at that moment.