For those wondering who Cao Ang and Cao Chong are:
Cao Ang was Cao Cao's eldest son who died early at 20 in battle.
Cao Chong was Cao Cao's 6th or 7th son who died early at 12 from illness. He was a genius who could converse with adults and even solve government problems. He was the full package- smart, kind, rich and handsome.
Cao Pi once mentioned that he was Cao Cao's third choice as the heir, and he only got the throne because these two guys died early.