The protagonist is Li Chengqian's novel

Li Chengqian and Chenxin were the main characters.

Li Chengqian was played by Li Liren.

Li Chengqian was played by Li Liren.

Li Chengqian was the eldest son of Emperor Taizong of the Tang Dynasty, Li Shimin. He was born in 619 AD. His name was given by Tang Gaozu Li Yuan. Because he was born in Chengqian Hall, he was named Li Chengqian. Li Chengqian was conferred the title of King Heng Shan when he was young, and later on, he was conferred the title of Sun Yat-sen King. He was smart and kind-hearted, and was favored and valued by Li Shimin. In order to cultivate his ability, Li Shimin arranged for two Confucian masters, Lu Deming and Kong Yingda, to teach him. However, Li Chengqian had some problems during his growth. He was jealous of his younger brother, Li Tai, and tried to launch a coup against the Black Tortoise Sect, but he failed in the end. In order to protect Li Chengqian, Li Shimin decided to make Li Zhi the Crown Prince and sent Li Chengqian to Qian Prefecture. Li Chengqian died in the 19th year of Zhenguan (645). He was posthumously presented as King Hengshan and Governor of Jingzhou. He was buried in Zhenguan Mausoleum with the etiquette of Duke of the State. As for the reason for Li Chengqian's limp and his role in the TV series "Celebrating Years," there was no mention of it in the current search results.

There were many options for the novel where the protagonist was reborn as Prince Li Chengqian, including " Reborn Li Chengqian Doesn't Want to Be a Prince,"" Reborn Emperor of Tang Li Chengqian,"" Prince of Tang Li Chengqian,"" Transmigrated to Li Chengqian's Son Li Xiang," and " The First Prince of Tang," etc.

It could be known that Li Chengqian and Chenxin had the following novels: 'Li Chengqian x Chenxin,''Losing Heart' by Xiaoyin,'' Qianxin's Fate of Three Generations,'' The Reckless Crown Prince Li Chengqian of the Great Tang,'and' From the Crown Prince Li Chengqian of the Qing Kingdom to Respect.'

It could be known that Li Chengqian and Chenxin had the following novels: 'Li Chengqian x Chenxin,''Losing Heart' by Xiaoyin,'' Qianxin's Fate of Three Generations,'' The Reckless Crown Prince Li Chengqian of the Great Tang,'and' From the Crown Prince Li Chengqian of the Qing Kingdom to Respect.'

" Transmigrated into Li Chengqian's son and started off against Li Shimin " was a novel with Li Xiang and Li Shimin as the main characters. The story was thrilling, depicting the growth and struggle of Li Xiang and Li Shimin. He had experienced hardships and setbacks, but he had never given up on pursuing his dreams. Through the battle with his heart and the conflict with the outside world, he gradually strengthened his beliefs and achieved brilliant achievements. This novel was full of inspiration and touching, allowing readers to have a deeper understanding of human nature and society.

" Transmigration to Li Chengqian's Son and Beginning to Fight Li Shimin " was a novel about transmigration. It told the story of the protagonist transmigrating to the Tang Empire and becoming Li Chengqian's son, Li Xiang and Li Shimin. This novel was meticulously written by the author, Brother Bao, and received the support of many readers. In the story, Li Chengqian was about to be deposed, but his son, Li Xiang and Li Shimin, stepped forward and showed his wisdom. The novel attracted a large number of readers with its compact plot and vivid three-dimensional characters. However, the details of the plot and content did not provide relevant information in the search results, so no more details could be provided.

There were many reasons for Li Chengqian's rebellion. On the surface, his dissatisfaction and fear towards Li Shi Min was the direct reason. He was dissatisfied with Li Shiming for executing his pet boy and others, and also dissatisfied with Li Shiming's teachings and discipline. He was afraid that Li Shi Min would depose him or let his brother Li Tai inherit the throne. He was also afraid that Li Shiming would discover his misdeeds or expose his rebellion plan. However, from a deeper perspective, the root cause of Li Chengqian's rebellion was the change in his personality and psychology. He had changed from a clever, cute, filial, and understanding Crown Prince to a dissolute, wanton, and delusional traitor. This change might be due to him being made Crown Prince too early, enjoying supreme glory and power, as well as the deterioration of his relationship with his father and the competition between his brothers. The leak of the rebellion plan, the lack of supporters, and the lack of military strength also led to the failure of the rebellion. Regarding the outcome of Li Chengqian's rebellion, there was no clear answer based on the given information.