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It's the auntie who stole Yiyon's embryo thinking it's Jinyao. She said it already at the last chapter that he followed the clues left by Jinyao after he got in an accident(remember when Jinyao was in a wheelchair when he was in a hospital abroad). I guess the auntie stole the embryo and uses it thinking it would be the first born from Jinyao since their family only approves a first born to be a successor of the clan.