The male lead is King Jing.

King Qi and King Jing were brothers, both sons of the emperor. King Qi was a scholar and was famous for his achievements and prestige. King Jing was a warrior and was outstanding in his military achievements. They had different specialties and talents. Although King Qi might be better in terms of political achievements and King Jing was more outstanding in terms of military achievements, their performance was affected by the Red Flame Case. King Qi was slandered and assassinated by Emperor Liang, while King Jing succeeded in ascending to the throne through the efforts of himself, Mei Changsu, and the others. As for the question of who was more suitable to be the emperor, Marquis Yan commented in the play that King Jing had been influenced by King Qi. His strategy of governing the country and his conduct had been passed down by King Qi, but his character was more determined and steady. Therefore, based on the information provided, it was impossible to determine who was more suitable to be the emperor.

The male protagonist's surname was Xiao, and the female protagonist's surname was Jing. This novel told the story of the male protagonist, Xiao Rong, and the female protagonist, Jing Changning. There was no information on where to read the novel.

The son of King Jing was King Jing's son. They were father and son.

The relationship between King Jing's son and King Jing was that of father and son. The son of King Jing was King Jing's son, and they were related.

The heir of King Jing and King Jing were cousins. The heir of King Jing was the Qing Emperor's younger brother, and King Jing was the Qing Emperor's son. Although the relationship between the two had never been good, they were described as representatives of two different forces in Joy of Life.

I'm not sure which book you're referring to because you didn't provide any relevant information. If you can provide more context or information, I will be very happy to provide you with a more accurate answer.

The male lead of Joy of Life was Li Hongcheng, the son of King Jing. Fan Ruoruo had chosen Li Hongcheng as her partner, and Li Hongcheng was devoted to Fan Ruoruo and had never married or had children. Therefore, Joy of Life was a novel with the male lead being the son of King Jing.

King Jing was the title of the Seventh Prince of Daliang Kingdom, and it was the first rank of nobility. He was a prestigious general in the army, an adult prince who had many military achievements and had made great contributions in Jingbian. He was also a good friend of Princess Nihuang. King Jing was played by Wang Kai in the drama "Nirvana in Fire". Finally, King Jing ascended the throne.

Liu Bei was a descendant of Liu Sheng, the son of Emperor Jing of the Han Dynasty.

The idle King Jing referred to the King Jing in Joy of Life. He was the Qing Emperor's younger brother and the idle King of the Qing Kingdom. King Jing appeared in front of the world with the appearance of an idle king to protect himself and his family. He was the only member of Joy of Life who did not participate in the fight for the throne. King Jing's ending was that he knew the truth of Ye Qingmei's death. As for other information about King Jing, such as the match between Xiao Jingting and Liang Jingkun in the Nirvana Board, it had nothing to do with King Jing in Joy of Life.