Sooo

I hope that it'll be Noah ╥﹏╥

Noah

Kinda obvious it's Noah

I think it's Noah, but
SPOILER (kinda):
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This Webtoon had a previous version with less beautiful art and it was pretty advanced I think. From what I know, even by then people were confused who the ML was going to be between Noah and Leo (the red haired 2nd prince) everyone was still leaning towards Noah because he's the one on the cover but there were some that were saying the author might surprise them and go for Leo.
Anyway, I personally love both of them, and even the crown prince isn't bad either. All of her love interests are HOT so I'm happy anyway.
Btw, the original version is no longer available (and I didn't read it so I don't know what's gonna happen). I guess we'll wait and see.