Upon Li Chu's entry into Luoyang, he initially announced that the Tang officials who had surrendered to Yan would be forgiven. However, soon they were rearrested and delivered to Chang'an. Several were executed, while many others were punished by demotion or exile. In winter 757, Li Chu returned to Chang'an with Guo, and was subsequently created the greater title of Prince of Chu. In spring 758, his title was changed to Prince of Cheng. Emperor Suzong wanted to further create him crown prince, but hesitated because Consort Zhang, who had since been created empress, had a son named Li Shao (), carrying the title of Prince of Zhao, whom she wanted to be crown prince. When he consulted the chancellor Li Kui, Li Kui advocated for Li Chu, and Emperor Suzong agreed, creating Li Chu crown prince on June 29, 758. He also changed Li Chu's name to Li Yu. However, it was said that Empress Zhang did not give up the idea of having Li Shao become crown prince and was looking for ways to undermine Li Yu. Li Yu tried to react with meekness and humility. After Li Shao died in 759, because Empress Zhang's other son, Li Tong () the Prince of Ding was still young, Li Yu's position was no longer threatened.