Ancestor Lin said, "Speaking of Yu Qingfeng, when I first entered the mountain sect, twelve hundred years ago, he was already the supreme Old Ancestor of Two Forget Peak. Back then, Two Forget Peak was practically the leader among the Thirty-Six Dojos of Biyou Academy. Needless to say, we owed it all to Old Ancestor Yu. The 93rd Deduction he left on Gantian Terrace took place when he had only just entered the Middle Corpse Stage. Even then, Old Ancestor Yu was already an extraordinary genius, with the potential to shake all of Biyou Academy."
"Legend has it that Old Ancestor Yu suddenly entered Gantian Terrace because inspiration had struck him, and he left behind the deduction. But then outside interference forced him to stop. Later, he returned to Gantian Terrace to continue, but they say he couldn't recapture the feeling, so he stopped again. After that, Old Ancestor Yu rose to great heights, but never entered Gantian Terrace again."
"Perhaps Old Ancestor Yu had privately solved the deduction, but left it there to inspire those who came after him. Or perhaps his cultivation had advanced so far that he no longer cared to spend time on the confusion he'd felt when his realm was low. There are all sorts of rumors, too many to count. But the most widespread, and the one that has endured to this day, is that his deduction was flawed from the start and could never be solved. That was why Old Ancestor Yu stopped bothering with it."
"That rumor already existed when I joined Two Forget Peak. Old Ancestor Yu was still alive then, so there's no way he hadn't heard it. Yet he never refuted it, which seemed to lend it even more credibility. But in my eyes, a heaven-gifted being like Old