The only reason Kloff married Rapiel was cause he looked like a dollar tree version of Aeroc but in came in omega font. Manhwa's are like picture books. They lack details. You fail to realize that if Aeroc were the one to marry someone else and rub his relationship in Kloff's face. There would be a bloodbath. So, read the novel, kid. Before making the air stinky with your rotten opinion.
when i saw ur comment was long i was ready for a really good take but i dont think i have ever seen someone miss the point so bad. Hopefully the other comments did a good job of educating u and u have a more learned opinion now so im not gonna say anothing but i do one leave u with one thing that the other comments have educated u on but i feel the need to reiterate it: Kloff NEVER EVER loved raphial. If ur talking about canon, the novel is the most canon he explains it there. In the 3rd life where kloff is the one that remebers, he makes it so that he never even looked at raphial in the first place. But even in the manhwa he admits he was just with raphial to piss off aeroc because kloff's dubas*s was too prideful to be with an alpha

Listen, I come back to read this story at least once a month. But I REFUSE to consider the second session and anything after the first life as canon.
Spoilers: keep reading at your own discretion.
Kloff was wrong to torture Aeroic. There is no excusing his horrible behavior, there is no excuse for the nightmare he forced Aeroic through.
But (because of course there's a but), from Kloff's perspective, this rich aristocratic fucker who he did NOT want a relationship with (yes, we know he did like Aeroic back in their first life but he's a coward so he never wanted to pursue him) killed his omega.
Now, we know that Kloff genuinely LOVED Rapel. Rapel did not deserve to die the way he did. He did not deserve the treatment he got. That omega got called poor by Aeroic then Aeroic's dumbass hired men to punish Rapel for getting with Kloff.
Sure, Aeroic did not want them to fucking murder Rapel— but what noble alpha would pay for another alpha's mate to be punished? Only Aeroic's dumbass. I feel that having been turned into an omega was probably a good punishment, I don't think that Kloff should have raped him, because that's horrible and fucked up, but maybe they could of worked out an agreement.
A trade of sorts, Aeroic took from Kloff what he could never have back—his family. His mate and pup. So it's only fair that Aeroic take that spot. I do think it's unpresidentially cruel how Kloff never allowed Aeroic to see their children after it was born, especially since at some point Kloff genuinely fell in love with Aeroic.
I think that maybe if both of them weren't so stupid they could of had a life together. A life where Kloff doesn't drown in grieve and a life where Aeroic isn't murdered. (ONLY SEASON ONE IS CANON. DO NOT TRY TO CONVINCE ME OTHERWISE.)