I wanna punch the friend because I'm sure he doesn't want him to give the blood to wo wo b...

No he is trying to stop him because the doctor said that the donor shouldn't be a part of the family, but he's wo wo's dad. What if something happens to wo wo bc luo xian mao actually stayed silent and let him give blood

But he is his dad and have the same blood type, what could go wrong? (I'm genuinely asking)

I suggest you read this thread if you want answers:
http://www.mangago.zone/home/mangatopic/9977865/

Thank you so much

then the baby will literally fucking die