The scroll is an antique and does not require expert identification. Li Nan can determine it only by his sense of smell.
But there is no inscription on the scroll. It's a lady carrying a flower hoe and an incense burner with three sticks of incense. So Li Nan can't really see that it was painted by any master in Chinese history.
But whoever paints it, even if it's a nameless generation, can laugh at the world of painting at all times and all over the world just by virtue of this artistic skill.
"It's a good thing. It won't be sold for any money. It's handed down to teachers...