Maybe spoiler
The princess (actually prince) is not biologically the emperor's child according to sources.
Who's the father then?
From what I read. The father is the assistant of the empress's father.
Yaauurrrrssssssss LESGOO GANG
Oooooooh but how? Didn't she break up with him?
She was pregnant before marrying the emperor, she kept it a secret to the whole empire, even the emperor didn't know because he is a scum. The empress even hid the fact that she gave birth to a boy because she doesn't want her son to be the crown prince and because he is still in live with her father's assistant. According to the sources.
I mean SHE is still in LOVE her father's assistant
Wait I’m actually a little heartbroken that the empress had kids with that shitty ass emperor