Why didn't Cao Cao kill Cao Pi at the end of Tongquetai?

Cao Cao didn't kill xelloss at the end of Tongquetai because he didn't have the heart to:

Cao Pi, a native of Peiguoqiao County (now Bozhou City, Anhui Province), was a politician and writer in the Three Kingdoms period, the second son of Cao Cao, the founding emperor of Cao Wei, and was also called Jian 'an Three Caos with his father Cao Cao and his brother Cao Zhi.

The year of Gengzi coincides with the unity of the four stars in the sky, which indicates the sign of regime change. Cao Cao's subordinate Chow Yun Fat, especially his son Xelloss Qiu Xinzhi, hoped to take this opportunity to publicize Xian Di's Zen position and Cao Cao's accession to the throne. At the same time, oppose Cao Cao's forces and step up actions. No one knows what earth-shattering things will happen in the world after the reunification of the four stars. ?

Behind the captive camps in Guanzhong and Han Sui, young Mu Shun and young Yi Fei were taken away by iron horses and brought to a huge mausoleum for cruel training. They will be molded into iron-blooded dead people and accomplish an unspeakable and shocking task.

Five years later, Cao Cao buried Guan Yu and returned to Tongquetai. The red coffin appeared beside Cao Cao.

Alec Su, the weak emperor of the Han Dynasty, and Yi Nengjing, the ambitious Fu Hou, kept silent about Cao Cao's return, and the ministers also had their own ulterior motives.

The four stars are about to merge, and a plot to assassinate Cao Cao is in full swing.