Will the orphan prototype son be sad when he decides to stay with his adoptive parents?

Personally, I don't think his biological parents will be sad. Because for this child, he has never thought of himself in the decades since he was with his adoptive parents. It may be abducted, not the biological child of the adoptive parents. So in this case, he doesn't know his life experience, so he can regard his adoptive parents as his own biological parents.

Then he has such deep feelings for his adoptive parents, which can actually prove from the side that the adoptive parents care for this child as if it were their own. Therefore, even when learning that he is not the biological child of his adoptive parents, the child still chooses to stay with his adoptive parents, which is enough to show that he has been taken care of by his adoptive parents over the years as much as he may be cared for and loved by his biological parents. Therefore, when the biological parents see that this child has made such a decision, I think to some extent, they should be happy.

I am glad that children have enjoyed the care of their biological parents in these decades, although they have not been with them. Of course, it may be sad for biological parents that their children have not chosen to return to their biological parents, because they must have hoped that their children would return to their own side in the process of searching for their children for decades, but if their children have not made such a choice in the end, I think parents may feel sad, but they will not be sad because of it.

Because as long as you find a child and see that his life is happy now, it is actually perfect for parents. Because at the beginning, I was afraid that my children would be abused or unhappy because they were not around, so I tried so hard to find them. Then, after seeing the child happy, for parents, there is actually not much concern in their hearts, so I don't think his biological parents will be sad.