I don't know if u read the raws but...
In the latest arc, Su Luxia is transported to ancient china and there she meets the second prince who is overweight and has some disorders and allergy to women or something I think, then to aid her mission Luxia offers to help him and so after she cures him using some medicinal skills she learnt in some other mission, she is shocked to see that after getting cured and going back to his original image, he looks exactly like her senior, agent zero and without realizing it, she actually sheds tears while looking at him, still in shock. Ngl that scene was kinda sad.
im interested about zero ( in case you don't know him or remember him he's dead because he ignored an warning and he had basically yellow hair not blonde and seems important to our mc )