Actually Jinhao told Yi since the very that the child is his and then later told him how he switched Yi Yun's sperm with his.
Spoiler Alert below
That's why people are speculating the the baby is Yi Yuns and not Jinhao. Myself included.
Ugg I didnt read over my response so now I see that I'm missing words lol. He told him since the beginning and later proved it later on. The spoiler is just about the latest chapter and speculation on my part.
Wait yeah actually silly me I knew Jinhao told YiYun the baby is his and YiYun already accepted that since he did a DNA test, I'm actually petty at the fact that he didn't explain he switched their sperm and I got fed up waiting for him to tell YiYun the truth *sigh* did they finally work it out? Does YiYun know the truth now?
Yes they did they in a good place now (≧∀≦)(▰˘◡˘▰)ლ(´ڡ`ლ)
I dropped this long time ago because I'm petty af that Jinhao haven't been truthful to YiYun and explain that the baby is his but I came back to read the latest chapter cuz I read somewhere that there's another baby and that's actually YiYun's haha