TBH, i don't think her being with the green boy IS a good Idea. In Another Story, i would Say yes but not in this one. Cuz I really feel that what she feels for him is not love. Since Dowun never showed her an ounce of the affection she wanted, she replaces that lack with this guy. But that's not love.
And TBH I really think a romance with Dowun would be much more interesting. There are things that make me think that he's really starting to like her (you only realise what you like once you've lost it) but there have been so many years of communication problems that it's going to be hard to unblock all that.
(Every chapter I'm dying to lock them in a room to communicate because they make me feel bad for those two).