Looking for specific manwha

Some time ago, I started to read a Manwha, and lost place of it. I can give a brief explanation as to how the story went, but that's all I can remember about it. It seemed rather nice, and it's a shame I lost it.

"The final boss in the tower, Max level with; 999 999 health and mana. Got bored of sitting in the tower and decided to change his fate, he went through a door after climbing some stairs to the human world. His health and abilities had taken a hit and was no longer invincible for he left his tower, and was weakened due to this fact.

One of the hero's who came into contact with t This "boss", had the ability of regression, he knew everything about the tower and what was going to happen, for he lived it. He became famous due to this ability.

The "Boss" had also taken a disguis from one of the hero's previously so that his identity wasn't so revealed. The "Hero" with the power of regression became puzzled and confused as this hero who was meant to die, was now standing in front of him. But it was the "Boss" who had changed his identity to them.

This is the extent of what I know, I apologise I don't know more. If at all, on the off chance that this is enough of a description, I'd be truly grateful 🙏

Thanks for taking the time to read and think on this. Love you all !