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Aunt stole yun semen from the bank thinking it was Feng jiyao's but no it's Yi yun's

So basically feng switched his and yiyuns sperm, which is why rourou is feng’s son biologically even tho yiyun beloved he was his. So what feng did was make it so that yiyuns sperm appear as fengs, and fengs aunt can’t have children so what she did was get feng’s sperm not knowing it’s isn’t his and made the baby, cause she wants a child that has the family’s blood. But like I said yiyun’s sperm was used so that baby is actually yiyuns. Hope this helps

Yiyi wanna have baby and give his semen to doctor but Mr.Feng change into his and Rou rou was born and he keep yiyi semen in secret but seems like that aunt stall ..which means Bighead that Rou rou saw in his dream is Yiyi child