"she's my daughter" THEY'RE ALL YOUR DAUGHTERS Σ(っ°Д °;)っ
I don't know what to tell you. At this point he might as well be a sperm donor for the rest of them. Think about it, he doesn't know any of their names, and they don't even have his last name (since only the princesses that the King acknowledges get his last name). The only ones who can count as his "daughters" are Sanghee and the other twin princess. For them, he's been a trash enough father, but at least a "father" under the minimum sense of the word.
MY DREAM CAME TRUE