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I'm not quite sure but this what you are looking for?
http://www.mangago.me/read-manga/kurui_naku_no_wa_boku_no_ban/
Thank you for replying.. But thats not it .. Its a manhwa and the omega actually sucessful because of his own hardwork.. And he actually does not look like an ume or omega... Quite buffed and so handsome too
I cant remember the title of the yaoi manhwa its omegaverse but the omega one is the one who sucessful and alsk dominant in sex.. And the alpha bit like puppy seme that fall hard for the omega