Tang Jiuer dared to say it because she was extremely confident in herself.
Before Tang Jiuer transmigrated, she was the top assassin in her original world. She had never failed in her life. Those who died in her hands were killed by her in a way that she thought was extremely artistic. If she hadn't stolen the secret of the organization behind her and been betrayed by it, she wouldn't have died.
Even so, before Tang Jiuer died, she took away more than half of the organization's people!
It was Tang Jiuer's pride as a top-notch assassin!
After Tang Jiuer died and transmigrated, she defeated several people who were suspected to be the chosen ones along the cultivation path. She had even suppressed a powerful "extraordinary book" in the hands of one of the chosen ones.