What is the stem of Xiuyande Mountain?

Xiuyan Deshan is a stalk in the Korean drama Please Answer 1988. Deshan's academic performance is very poor. When telling fortune, people said that changing her name to Xiuyan would improve her grades, so everyone called her Xiuyan.

Please answer 1988 is a youth nostalgic drama directed by Won-Ho Shin, written by Li Youjing and starring Li Huili, Park Baogen, Liu Junyi and Gao Gengshao. On June 6th, 20/KOOC-0//KOOC-0/5, it was broadcast on the golden soil file of tvN TV station in South Korea.