Generally speaking, this is a running script.
To be exact, the word "You" was written by Jing Shijiang, a native of Zhong Sheng Town, nanbu county, Sichuan. You can find his information on the internet, as well as his calligraphy font.
The word "ran" comes from the post-Song Fengge Poem by Huang Tingjian, a great calligrapher in the Song Dynasty, but the lower left and upper right points have been changed. You can compare it with the original post