So when Yi Yun wanted a baby, he got an embryo inseminated. However, Jinyao needed Yi Yun to raise his child so instead of letting this embryo gestate, he switched the embryo to one that was inseminated by himself and let this become Rourou.
Jinyao felt kinda bad for doing this in the first place, so he stored away Yi Yun's embryo for safekeeping in order for Yiyun to be able to have a biological child later on (with the embryo he'd originally chosen for himself). This embryo has since been stolen cuz the ones who stole it (*cough* his aunt *cough*) thought it belonged to Jinyao, and wanted to prevent him from have a first born (cuz the child would automatically be an heir being first born of an first born)
I finally get it now, thank you for explaining it to me!
I am so confused, can someone please explain to me what Jinyao means by it being Yiyun’s embryo? I thought I was right but I’m looking at the comment section and it’s making me more confused