What is the reason why Cao Cao, a military adviser alliance, doesn't like Cao Pi?
Cao Ang, the eldest son, died to save xelloss. For many years, Cao Cao had a hard time, so he was dissatisfied with xelloss. On the contrary, Cao Zhi is quick-thinking. Every time Cao Cao asks several sons, Cao Zhi can blurt out the answer. Cao Cao loves Cao Zhi very much.
Cao Zhi's calm temperament, no prestige, no bureaucracy, no free and easy, no scheming, no pursuit of gorgeous clothes, and he is very interested in thrifty Cao Cao. So Cao Zhi is very popular with Cao Cao.
In contrast, Cao Pi is weak in literary talent, heavy in scheming and rigid in character, and Cao Cao doesn't like him.