In the Grand Elder's impression, if Daoist Buyu was this enthusiastic, it certainly meant that there was some kind of scheme.
He became cautious.
The Grand Elder believed Daoist Buyu had a reason to harm him, Daoist Buyu was taken to the mountain by Old Three when he was still a baby, becoming the youngest disciple. As no one from the master to the senior brothers and sisters took care of the baby, he gradually figured it out on his own.
The Grand Elder was proficient in the Dream Spell. When Daoist Buyu was still a child and restless, unable to sleep, he would use the Dream Spell to lull Daoist Buyu into a deep sleep.
When Daoist Buyu grew up to the point of cultivation, he was always sleepy during his training. The Grand Elder would use the Dream Spell to scare him awake. Perhaps because he was too terrified, to this day Daoist Buyu still has a psychological shadow.