There were four grandmasters in Joy of Life. They were Northern Qi's Ku Zhu, Qing Kingdom's Ye Liuyun, Qing Emperor, and Dongyi's Sigu Jian. There was no information about the actor of Joy of Life, so he could not answer this question.

There were four Great Grandmasters in Joy of Life. They were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. The Qing Emperor was played by Chen Daoming, Ku He was not mentioned, Ye Liuyun was not mentioned, and Sigu Jian was not mentioned.
Joy of Life was played by four people. They were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. The Qing Emperor was played by Chen Daoming. Ku He, Ye Liuyun, and Sigu Jian were not mentioned.
The Great Grandmaster characters in Joy of Life were played by Chen Daoming as the Qing Emperor, Ku He as the unmentioned actor, Ye Liuyun as the unmentioned actor, and Sigu Jian as Sigu Jian.
The Great Grandmaster characters in Joy of Life were played by the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. Among them, the Qing Emperor was played by Chen Daoming. He was considered the strongest of the Four Grandmasters. Ku He was played by an unknown actor. He was the Northern Qi Imperial Advisor and possessed powerful martial arts. Ye Liuyun was played by an unknown actor. He was a casual fighter and was good at swordsmanship. Sigu Jian was played by an unknown actor. He was a master of Dongyi. These four grandmasters were all top-notch martial arts experts in the show.
The Great Grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. The Qing Emperor was the one with the highest martial arts skills among the Four Great Grandmasters. Through the Tyrannical zhenqi that Ye Qingmei gave him, he broke through the ceiling of his martial strength and became the most powerful Great Grandmaster. Ku He was the Imperial Advisor of Northern Qi. He had become a Great Grandmaster by breaking through the upper ninth-level. Ye Liuyun had comprehended the Flowing Cloud Sanshou after fighting with Wu Zhu, and then he had broken through to become a martial grandmaster. Sigu Jian had obtained a secret manual from his contact with Ye Qingmei and became a Great Grandmaster. These four grandmasters displayed their powerful martial arts and unique identities in the show. They were the most legendary existences in Joy of Life.
The Great Grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. Among them, the Qing Emperor was the one with the highest martial arts skills among the Four Great Grandmasters. He was hidden in the Qing Royal Palace. Ku He was the Imperial Advisor of Northern Qi. He had become a Great Grandmaster by breaking through the upper ninth-level. Ye Liuyun was from the Qing Kingdom. Through fighting with Wu Zhu, he comprehended swordsmanship and became a grandmaster. Sigu Jian was Dongyi's guardian. These four great grandmasters were all closely related to Ye Qingmei. Three of them had received Ye Qingmei's guidance and became grandmasters. The Qing Emperor was the Emperor of the Qing Kingdom, Ku He was the Imperial Advisor of Northern Qi, Ye Liuyun was a member of the Ye family, and Sigu Jian was the guardian of Dongyi. They were all very powerful, and each of them had their own unique cultivation methods and techniques. The Qing Emperor cultivated Tyrannical zhenqi and the Way of the King. Ku He had obtained the Tianyi Dao technique that Ye Qingmei had given him. Ye Liuyun had comprehended the Flowing Cloud Sanshou through his fight with Wu Zhu. Sigu Jian had comprehended the sword technique himself. These four grandmasters were very powerful existences in the world of Joy of Life. Their strength was equivalent to modern nuclear weapons.
The Great Grandmasters of the Qing Dynasty were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. Among them, the Qing Emperor was the one with the highest martial arts skills among the Four Great Grandmasters. He was hidden in the Qing Royal Palace. Ku He was the Imperial Advisor of Northern Qi. He had become a Great Grandmaster by breaking through the upper ninth-level. Ye Liuyun was from the Qing Kingdom. Through fighting with Wu Zhu, he comprehended swordsmanship and became a grandmaster. Sigu Jian's description was few, but he had become one of the Four Great Grandmasters with his self-created sword techniques and profound martial arts. Thus, the Great Grandmasters in the Qing Dynasty included the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian.
The Great Grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. Among them, the Qing Emperor was the one with the highest martial arts skills among the Four Great Grandmasters. He was hidden in the Qing Royal Palace. Ku He was the Imperial Advisor of Northern Qi. He had become a Great Grandmaster by breaking through the upper ninth-level. Ye Liuyun was from the Qing Kingdom. Through fighting with Wu Zhu, he comprehended swordsmanship and became a grandmaster. Thus, the Great Grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian.
The Great Grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. The Qing Emperor was the strongest of the four grandmasters. He hid in the Qing Royal Palace and had the aura of an overlord. Ku He was the Imperial Advisor of Northern Qi. He had become a grandmaster through practicing Tianyi Dao. Ye Liuyun was from the Qing Kingdom and was good at the Flowing Cloud Sanshou. After fighting with Wu Zhu, he had comprehended swordsmanship and became a grandmaster. Sigu Jian was Dongyi's guardian and a powerful Great Grandmaster. The existence of these four Grandmasters made Qing Kingdom, Northern Qi, and Dongyi not dare to easily start a war. Thus, the Great Grandmasters in Joy of Life included the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian.
The Great Grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian. Among them, the Qing Emperor was considered the strongest of the four grandmasters. He was a Great Grandmaster, and the other three grandmasters were not the Qing Emperor's match. Ku He was Northern Qi's Imperial Advisor, a peerless expert who possessed the heaven-blessed theology of the temple. Ye Liuyun was using the Flowing Cloud Sanshou, and his swordsmanship was terrifying. Sigu Jian was Dongyi's guardian and the true master of the Sword Hut and Taiping money house. These four Grandmasters held a pivotal position in the Qing Kingdom's martial arts world and represented the highest level of the Qing Kingdom's martial arts world. Thus, the Great Grandmasters in Joy of Life were the Qing Emperor, Ku He, Ye Liuyun, and Sigu Jian.