Does anyone know what font this is? Which calligrapher has the same copybook as this font?

That's not true.

This is cursive, that is, a font between cursive and cursive. The characters such as solitary, pavilion, water, tree, who, Yan, Chun and Zui are standard cursive symbols, and other characters are standard cursive symbols. This kind of writing is vividly called "sleet", which is cursive.