Responses
By injecting chowon with sperm, this is actually pretty common as a second choice or plan B when the husband/male in the relationship is unable to carry legitimate sperm for the wife/female to conceive so like how some people/girls surrogate for other women that are unable to conceive, others women inject themselves with sperm from a willing mab to conceive when the husband cant.
So how was Bin conceived? Artificial insemination or something?