The mf is only a prince NOT a king. Geumho was not RAPED but tortured (when the mf'ng prince was taunting Seonwoo on the way to Ahn's estate the proper translation should be "Are you afraid im going to molest him?" NOT "ra** him again" twas a mistranslation besides... Beom got the first dibs on Geumho's 🍑 the latter confirmed this to Beom in chapter 26, further proof is on the earlier chapter when Beom has to stop thrusting bec. Geumho's a$$ was bleeding) anyway, the prince got into trouble with the other nobles bec. of what he did with Geumho and the only way he got away with a harsher punishment was bec. his mother was the favorite concubine of the King.
Seonwoo's younger bro was right when he said that the only way to stop this psycho's manipulating streak was to marry the princess/another royal. It's an even playing field now. One wrong move of this psychopath again and you know the princess is going to counter it and get his a$$.