The four grandmasters in Joy of Life were all humans. Ku He was the Northern Qi Imperial Advisor, Sigu Jian was the protector of Dongyi, Ye Liuyun was the protector of the Ye family, and the Qing Emperor was the Qing Emperor. In the setting of Joy of Life, they relied on their own techniques and experiences to become the Four Great Grandmasters. Although they were powerful, they were all human characters.

Joy of Life's Four Great Grandmasters were Sigu Jian, Ye Liuyun, Ku He, and the Qing Emperor.
The four Grandmasters of Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian.
The Four Great Grandmasters in Joy of Life were the Qing Emperor, Sigu Jian, Ye Liuyun, and Ku He.
The Four Great Grandmasters in Joy of Life were the Qing Emperor, Sigu Jian, Ye Liuyun, and Ku He.
The four grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. The Qing Emperor was the Emperor of the Qing Kingdom, Ku He was the Imperial Advisor of the Beiqi Kingdom, Ye Liuyun was the Grandmaster of the Qing Kingdom, and Sigu Jian was the City Lord of Dongyi. These four Grandmasters were all related to Ye Qingmei. Ye Qingmei had given them secret manuals to help them become Grandmasters. Each of them had their own unique martial arts and skills, which played an important role in the story of Joy of Life.
The four grandmasters in Joy of Life were Sigu Jian, Ye Liuyun, Ku He, and the Qing Emperor.
The four grandmasters in Joy of Life were the Qing Emperor, Sigu Jian, Ye Liuyun, and Ku He.
The four grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian.
In Joy of Life, the four grandmasters who were considered good people were Chen Pingping, Yan Ruohai, Li Chungang, and Fei Jie. Chen Pingping was very loyal to the Qing Emperor and Fan Xian and had helped them many times. Yan Ruohai was loyal to the Qing Kingdom and the Emperor. After learning that his son had been captured by Northern Qi, he still thought about the people of the Qing Kingdom. Li Chungang and Fei Jie's situation was not mentioned. Therefore, according to the information provided, the four grandmasters in Joy of Life were considered good people.
The four grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian.