.. Oh I remember reading this novel version a long time ago..

Spoilers please

Spoiler below
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As far as I remember (I hope my memories serve me right), the MC will end up with the knight (Jade). There's secret identity about Jade(if I'm not wrong, he's a noble). He proposed to her and it's a bit clumsy i think
Not something so romantic but sweet and blunt, asking if she would like to work for him (as a wife of course). The prince will end up with another girl

Thank you (づ￣ ³￣)づ