"They wanted to take possession of the Four Saints Techniques!"
Bai Su saw the Black Tortoise Sorcery and recalled what Shenyue had told her.
It was only before she participated in the third challenge, having qualified for the final step, that Shenyue brought her here to inform her of the mission.
She was only ever considered an alternative plan, and even before that she wasn't even an alternative, merely chosen because of her decent aptitude, and because the originally arranged personnel had suffered heavy losses, which prompted the organization to consider cultivating new talents.
Whether she could seize the opportunity, however, depended on her performance.
Although the process was far from perfect, and she had nearly died under the claws of that Chen Family brat's Ancient Demon, she had ultimately obtained the Black Tortoise Seal and fulfilled her prior requirements.