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Xu Xiangyang made a week's promise in front of the two girls precisely because he hoped to cut off his "retreat" with this method, no longer harboring the illusion that he could keep dragging the matter on.
If he still couldn't fulfill his promise in the end, the people questioning him would not be limited to Qing Yue alone; an intrigued Xing Jie would definitely not be able to resist asking.
He could barely withstand the pressure from class president alone but add to that the interrogation from another person involved, and he would inevitably choose to raise his hands in surrender and reveal his true thoughts.
If he could, via his own will, make sense of his thoughts about Xing Jie and resolve to speak up on his own, that would certainly be the most responsible way to act; but if he couldn't manage that, then he might as well give up resisting.
And during this free time, he hoped to uncover the truth behind Guo Zixuan's hanging suicide.