After Qiu Jidan was frightened half to death by Zhang Ze due to the Cold City affair, he became utterly absorbed in reading.
It's unclear whether it was the Sword Hall's old sword cultivator being an innate teaching saint, or if Qiu Jidan's humanity hadn't entirely eroded, or if the Illusion Realm truly can change a person.
After reading all the chicken soup stored in the Sword Hall, he partially converted to goodness.
But only partially.
Thus, for a long time afterward, Qiu Jidan remained in a state of extreme confliction, feeling as if two small figures were fighting in his mind.
Kind-hearted Hero Chou advised himself, based on the Sword Sect's compiled "Evil Cultivator Handling Guide," that someone like him, when caught, generally wouldn't survive more than three days.
Therefore, he ought to surrender himself and then meet his end.
But when he aimed the knife at his own chest, he reverted to his original self.