Spoilers
Michael had fallen for Irene the moment she had asked him to b his pair......since he grew up in temple he had a hard time to understand his own feelings.....he tried to stay away from her to sort out his feelings and not to show it to Irene. But everything he did only made Irene the eyesore n Cecilia took advantage of it. After Michael got injured lost his mind n spend the n8 with Irene, he was disgusted with himself so he ran away. He got himself excommunicated to be with her. By the time he returned to propose to Irene she was dead. Only after her death Michael slowly came to know about all hardships she had faced. And after confirming Cecilia deliberately sent here to the dungeon, he brutally massacred her family, Knights n maids, then count rhodium and everyone in his estate. After which he went on to massacre every single monster to reverse time with the help of an artifact....some thousand times I think. BTW that artifact is the main villain. But he never once blamed or hated Irene. That man is just obsessed with her.
New timeline Michael is the king of all monsters.
Spoilers
It doesn't deal with time reversal....it's more like the artifact kept creating new worlds but none of them had Irene in it. So after going through that cycle thousands of times Michael finally meets Irene in this world. This Michael is the og Michael from the og world. Rest everyone belongs to this new world. This world actually doesn't have a Michael. So it's Irene's 2nd life but Michael's life is continuing from the very beginning
Spoilers
From the og timeline, he has been continuously killing monsters to fulfill certain conditions to rewind time. But the artifact instead of rewinding, creates copy of the og world where Irene died. None of the worlds it created were perfect so there were always some differences n Irene was always absent in every one of them. So Michael had to keep on killing n killing monsters in every new world to start again. The miasma accumulated in him since there was no purifier and it ultimately turned him into a monster.....n then the king of all monsters because the net miasma in him became more than any existing monster. He's able to wield it freely without letting it slip. Besides throughout the novel, there was not much mention or exhibition of holy power. This story is mostly like guides n espers

I'm glad they're starting to narrate Michael's perspectives. Of course I want the storyline to progress faster but beyond all that, I'm more obsess with how good the artwork is. I'm still into slow paced perfect art than low quality and boring storyline. So yeah, I'm loving every bit of suspense on exposing Michael's intentions. So nice and heartwarming.
Maybe, in their previous life after Ireen's death Michael discovered Ireen's sufferings just to earn 100k golds but still chose to sacrifice herself just to purify him. But when he was about to see Ireen and apologize to her he discovered that Cecilia's the one behind Ireen's death.