This was to create an illusion. Xinghe's plan was to use the contagious flu to completely ruin this orphanage; they would not be allowed to operate anymore in the future. The files in the basement had been moved away after she hacked the lock. No one would know what really happened that night.
Before the sun rose, everyone at the orphanage had fallen ill. The strength of the contagion was so strong that even the bodyguards and doctors refused to get close to the orphanage even if they were wearing an MET suit. Only Xinghe's group volunteered to do the job.
At the same time, He Bin had received the update from Xinghe. Every important member of the He Lan family was briefed on everything that happened at the orphanage. When they saw the video taken by Xinghe, they were shocked because they did not expect the contagious flu to be so fatal.