Yuji was a smart woman that even a terrifying character such as the Joyous Palace Master once regarded her as a think tank. It was also thanks to her wisdom that the latter also feared her and thus sent her out to deal with the issues on the front lines.
Prior to this, it was Tang Xiu's strength that made her apprehensive, yet she didn't choose to betray the Joyous Palace Master even though she faced the threat of death. She did agree to submit to Tang Xiu orally but was very resistant to the idea inwardly. Even after getting the treatment, she had already planned to challenge Tang Xiu to probe his strength further, while at the same time, prepping her escape at any time.
At this moment, however, her heart went cold as only now did she realize that this young Chinese cultivator not only had cultivated his strength to the extreme but also had frightening wisdom. He seemed to be able to see through her intentions and arranged the array while she was recuperating.