Comment by Phantom Ocean on Can I Cry Now? - Chapter 53

This "fake" is actually the previous emperor's daughter so the mark is shown to everyone during a check(I read the spoilers cus I was lowkey frustrated if it was like those real vs fake child manhwas) later it is found out that mc is his bio kid. And emperor is conflicted when this random kid comes outta nowhere and calls him daddy during a banquet, and the mc had a nanny who got traumatized when she lost mc. And the dad likes mc more btw they have bonded more so it makes sense

This norma lady(I think it's her? I'm sorry i don't remember)over here manipulated the nanny who was broken from losing mc, that the fake is the real daughter who she lost. So nanny attested to the emperor that she is the real kid. But emperor refused to acknowledge the fake as imperial princess due to her attitude(kinda iffy about the reason but yeah, he didn't announce her as a princess) 

Due to Mc's mom(powers? Bloodline??), the mark was hidden/not shown. There will be an incident where the dad finally finds out that the kid he was looking after and loving was actually his kid through blood too. 

Also don't the fake kid, she just 7 manipulated by the things the adults around her are saying, and kids are little devils at that age