What's behind a joke "I said 13 years old wants to be an emperor and 23 years old wants to be a Chen Jingrun"?

When I was three years old, I said I wanted to be an emperor when I grew up, and my mother smiled. When I was thirteen, I said that I would be a new generation of Chen Jingrun, and my mother smiled. When I called home just now, I said, "Mom, in fact, I'm just a daffodil that you've kept for more than 20 years but still won't bloom ..." On the phone, I heard my mother crying, and my father angrily grabbed the phone and shouted, "When did your boy learn to play dumb? ! ! "