I don't think that's a spoiler... I kinda find it obvious... They match more than the fl with yellow haired prince in my opinion but its still depressing if this manwha goes down the love triangle route.
Some readers like me was surprise that the prince in the cover is not the 2nd male lead so it is consider spoiler. And yes it it obvious that the duke is the ML. Of course. I dunno girl maybe youd get heartbroken too for the 2nd ml theres kinda yaoi twist here.
Yaoi twist? Now that's interesting!
Yaaaaas girl. I wanna tell moreee but imma leave it as is. So youd look forward to what bl twist am talkin about.
I can't wait!
SPOILER
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Black hair guy is the real ml (they really like each other)
2nd ml seems to be the supposed crown prince (my chest tightens for this baby)
Current crown prince is piece of shit and the prince who visit her a lot only wanted to use her for Rodell dukedom support. （￣へ￣）