Where can I find the calligraphy decoration behind Emperor Zhu Yuanzhang in episode 24 of Mrs. She Xiang's TV series? The font is quite good. I want to learn it. I wonder where I can find it.

All kinds of calligraphy are sold in the market. Since you say it looks good, it is probably Evonne's "thin golden body" in Song Huizong, which is unique and rarely circulated in the market. The main painters work here; As for the others, running script (Wang Xizhi, Wang Xianzhi, Su Shi, Zhao Mengfu), regular script (Yan) (lower case: Wen Zhiming), cursive script (Zhang Xu, Huai Su). These are the most popular books.