I knew it! The bighead in Rourou's dream is his sibling!

hi, im confused. only if it's okay, how is bighead also yiyuns child?

At the beginning of the series yiyi gave his sperm to the surrogate but feng switched it with his to have rourou. However feng Yao never destroyed yiyi’s sperm and stored it somewhere safe. In the middle of the series we learn the aunt actually stole yiyis sperm thinking it was fengs. Now the aunt has a baby that’s actually yiyi’s