
it's more or less like this:
-1 timeline - tragic. Aerock and Rapiel die, Kloff's children abandon him and he dies in solitude.
-2 timeline - happy. Aerock goes back in time to just before he met Kloff, having memories from the 1st timeline and is determined to do everything differently. I won't tell the rest so as not to give spoilers.
-3 timeline - bittersweet. This time, it is Kloff from the 1st timeline who goes back in time and his memories are preserved. As Kloff from the 1st timeline went crazy after Rapiel's death, he doesn't behave well when he meets Aerock. It suffers a lot and has a partly happy and partly sad ending.

Someone post a spoiler from different site,he said kloff in his third timeline tried to kill aeroc but aeroc defend himself and kloff died by aeroc's hand..and kloff is having s*x with someone before trying to kill aeroc.i dunno if that true,if that's the ending it's not bittersweet at all its a very sad ending..I hope it's not true.

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As far as I remember, this isn't the ending. In the end Kloff tries to commit suicide but Aerock doesn't allow it. they stay together, but Kloff is never completely happy because as much as he likes this Aerock, he's not the one who died. But as he has nothing to do to avoid the death of the one from the 1st timeline, he stays with Aerock from that timeline and decides to take good care of him.
Please tell me this is the last timeline