https://www.novelupdates.com/series/beware-of-the-brothers/ Is where to read the English translation though it's not complete yet.
It's already completed on the original Korean website (kakao), you could always use a translator to read that if you're desperate haha
So thats why it took her so long to get married, cuz Eugene liked her from the past timeline. (Eugene decides the wedding of Hari and Johan)
And based on Eugene these past few chapters, it seems like even the past tl Eugene doesn't want to be married with his wife- he just did because Hari asked what wedding gift would he want. ouo oh dang idk what to feel.
Ps: I havent read the novel yet I'm just jumping into conclusions AHAHAHAH

SPOILERS
Based on the novel, she ends up with Eugene (the oldest brother)