Is that Yi Yun's lost embryo? That baby totally felt safe and familiar with Yi Yi and Yi Yi probably felt the same familiarity when he saw and held the baby. That's probably why he can see him as a baby and not a duck. Poor Rou Rou, he is oblivious because he is only just a child but he has the power to bring people together. I hope Yi Yun doesn't forget the "dream" when he wakes up and gets to see the baby in person.
I was waiting for this chapter! I didn't know it was the last chapter.