Wait... I thought only Yi Yun can produce egg..

There's no way he could produce an egg. It's a fertilized egg of YI YUN's sperm and foreign woman's egg. FENG JINYAO also use the egg of that foreign woman and made that woman pregnant with his child. YI YUN's fertilized egg wasn't put into the womb because of that (FENG JINYAO snatched his chance). And FENG JINYAO stored YI YUN's fertilized egg which wasn't put into the woman's womb.

oh ok thanks im dumb ik