From my whatever memories I know. Fenrir (the one who looks like the ML but is a beast) is friends with our MC. Fenrir basically wanted to fulfill MC’s wish of resetting time because he realised that he id making his lover (ML) suffer because of his own suffering. Fenrir complied and went back in time (I think) to the beginning where MC doesn’t meet fenrir? Or Fenrir changed something that caused the current timeline to be less chaotic and depressing than the previous/OG timeline. Our MC received all this information because he peered into the Fenrir’s memories and looked at the past timeline