Transmigrated as Muzan, I Try to Save Myself

The following is a confession from the protagonist of this story:

As someone who has lived alone ever since I was a child, transmigrating itself doesn't scare me. I can even accept transmigrating into a character from a movie, TV show, or anime. After all, these days transmigration novels and shows are bursting onto the scene everywhere, all clichéd and overdone.

But

That doesn't mean I can accept transmigrating into a major villain who hasn't finished their plotline (emphasis added) and is saddled with buffs like "dies in sunlight," "man-eater," "mass murderer," "so vile that even gods and men despise him," "all his subordinates are villains," and "the protagonist's archenemy"...

So on my first night after transmigrating, I stayed up all night thinking about how to make it through the plot intact under the righteous protagonist's blade (strikethrough) and simply stay alive.

Kibutsuji Muzan (the protagonist of this story): "Nakime, I order you to send me to the deepest part of the Infinity Castle. Then lock the doors and windows, and wait for a hundred years."

Nakime: ?

Anyway, first things first, I'll lie low. A hundred years from now, the protagonist will have died of old age as a pure-blooded human! I'm a genius!

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P.S. The protagonist isn't a good person (or even a person?). He can be nasty without realizing it, has a low moral threshold, and is selfish. He's a master of lying low, and his alignment is Lawful Evil.

P.P.S. The protagonist is the pursuer, but I haven't decided on the pairing. Most likely, he'll have arrows pointing at him from every direction.

P.P.P.S. This is my first attempt at writing a non-heroic character, so please forgive any bugs. The protagonist's morals and values do not represent the author's morals and values (bold and red)!

Theme: Maybe Muzan's face is just too handsome