Joy of Life's Danzhou assassination was planned by Li Yunrui. Li Yunrui was the Eldest Princess. She had sent Teng Zijing to assassinate Fan Xian. However, the assassination failed. Teng Zijing eventually became Fan Xian's trusted aide. Thus, it could be confirmed that the assassination of Fan Xian in Danzhou was arranged by Li Yunrui.

Joy of Life's Danzhou assassination was planned by Li Yunrui. Li Yunrui was the Eldest Princess. She had sent Teng Zijing to assassinate Fan Xian. However, the assassination failed. Teng Zijing eventually became Fan Xian's trusted aide. Thus, it could be confirmed that the assassination of Fan Xian in Danzhou was arranged by Li Yunrui.
The exact episode number of Joy of Life's assassination in Danzhou was not explicitly mentioned in the search results provided, so I don't know which episode Joy of Life's assassination in Danzhou was in.
Danzhou in Joy of Life was located in the Penglai region of the Shandong Peninsula. According to the search results and map information provided, Qing Kingdom was a country on land near the sea. There were no small islands. Although some search results mentioned that Danzhou might refer to the real Danzhou City, according to maps and other information, the real Danzhou should be in the Penglai area of the Shandong Peninsula.
During the Qing years, Danzhou was considered to be located in Penglai, Shandong Peninsula. Although there were some different opinions, most of the search results pointed to this location. Therefore, it could be concluded that Danzhou in the last year of Qing should be located in the Penglai area of the Shandong Peninsula.
The masterminds behind Joy of Life's Danzhou assassination were Li Yunrui and Lin Gong. Li Yunrui was the Eldest Princess. She had sent Teng Zijing to assassinate Fan Xian, but the assassination had failed. Lin Gong was the mastermind behind the assassination attempt on Fan Xian at Niulan Street. He and Wu Bo 'an had planned the assassination together. Therefore, it could be confirmed that the mastermind behind Joy of Life's Danzhou assassination was Li Yunrui and Lin Gong.
The masterminds behind the assassination at Niulan Street were Lin Gong and Wu Bo 'an. Lin Gong was the mastermind behind Fan Xian's assassination attempt on Niulan Street, and Wu Bo 'an was the strategist. They had planned the assassination together.
In Joy of Life, the masterminds behind the Niulan Street assassination were Lin Gong and Wu Bo 'an. Lin Gong was the mastermind behind Fan Xian's assassination attempt on Niulan Street, and Wu Bo 'an was the strategist. They had planned the assassination together. In addition, the Second Prince and Eldest Princess also participated in this plan to assassinate Fan Xian.
The mastermind behind the Niulan Street assassination was Lin Gong. Lin Gong was the murderer ordered by the Eldest Princess, Li Yunrui. He planned the assassination on Niulan Street. In addition, the Second Prince and Eldest Princess also participated in this plan to assassinate Fan Xian. This information came from Joy of Life.
The assassination of Fan Xian in Danzhou was arranged by Li Yunrui.
In " Joy of Life," the murderer behind Fan Xian's assassination in Danzhou was Li Yunrui. Li Yunrui was the Eldest Princess. She had sent Teng Zijing to assassinate Fan Xian. However, the assassination failed. Teng Zijing eventually became Fan Xian's trusted aide. Thus, it could be confirmed that the assassination of Fan Xian in Danzhou was arranged by Li Yunrui.