
SPOILER!!!!
In the novel they state that actually each of the number(something that pop up on their head) have different colour. Each colour have different meaning of love.
Unfortunately eclise (gray),which means betray love. He gonna betray penelope, he bring the real duke's daughter to the duchy. He do that so that Penelope will never leave him and always need his help.he gonna do everything so Penelope will never leave him even he needs to betray her.
For her 1st brother it's mean 1st love(yellow) he loves Penelope more than just a sister. Bc of that u can see he seems jealous when the duke got the charm from Penelope and not him. Then, when his real sister comeback, his sister gonna brainwash him and make he hate Penelope.
Her 2nd brother is happy love(pink). He actually love Penelope so much as his sister but he don't wanna express his feeling. He care and happy bout Penelope. When 1st brother in the brainwash phase where he hate Penelope,this 2nd brother gonna protect Penelope and side with her*I'm touched
For the wizard. (Blue)It's imperfect love. He love Penelope even in the past and now. He's the one that reverse the time back bc he can't bear to see Penelope die and suffer. Penelope had isekai for many times if I'm not mistaken and each time Penelope gonna die,the wizard reverse the time to the past. He knows Penelope will only survive if she end up with the prince. So for this time, he wanna Penelope to survive and happy even not with him.
Last one, the prince(red). It's mean passionate love. He's the true love and the other half of Penelope. He gonna protect Penelope from the real duke's daughter.*he's the ml
Whose the ML? I know it's not Eclise coz he's ASDFGHJKL.