In the final analysis, this was the reason.
Yao Yao, however, was individually-focused. She was like an exquisite specimen that could be recycled.
Instead of destroying her, it was better to keep her safe and take good care of her.
Then they could continuously experiment on her, and one day, they might get a big surprise.
But things were different with the Ouyang sisters, Ouyang Yue and Ouyang Sheng.
They were almost like ticking time bombs. If one day someone saw through their true strengths, then they would inevitably be pursued and besieged by the Federation or some large factions, or even coveted by the Beast Clan group.
Because their existence, no matter which faction they were in, if used correctly, could absolutely play a decisive role.
Moreover, if they found the right cultivation method or martial arts, perhaps they could pave another mental energy path, almost identical to Wang Zhan's current path of deception.
