@Eugene sehwa didn’t become “capable of pregnancy” from Kim’s drug
"STILL, IT'S DIFFICULT TO IMAGINE THAT LIEUTENANT KIM'S DRUG ALONE MADE LEE SEHWA CAPABLE OF PREGNANCY."
This definitely clear my doubt. The drug doesn’t give him a womb he was already capable. Kim’s drug is for inducing pregnancy, not creating the ability. Taejeong know this but they plan to lie in court and say the drug caused it. That makes the crime sound worse.