If Yu Huang had not recognized the killing net and that the scrap metal on the ground were all incomplete divine-grade spirit artifacts, she would have indeed treated Professor Song's instructions as a joke.
But she understood that Professor Song was telling the truth.
Yu Huang didn't tell Professor Song that she recognized the killing net. As she lowered her eyes and stared at the scrap metal, she pretended to be curious and asked, "Why did you collect these shabby things? These things look quite old. They're not worth much even if you sell them."
As Professor Song ate his food, he replied aloofly, "I like to repair junk."
Yu Huang was shocked.
Professor Song could actually repair divine artifacts!
"Why go through so much trouble to repair these shabby things?"