Climbing a Tower Which Even Regressors Couldn’t Conquer

My Girlfriend, who was drunk and lost her mind, suddenly said a strange thing.
Su-hyeok, I’ve regressed.

Regressed?

Yes, I’ve come back in time.

Are you crazy?

You are the only hope for humanity.

And then I was taken to the tower… But it doesn’t matter!
Regressor? Tower? Trials? Whatever it is, It doesn’t matter but what I know is I’ll conquer this goddamn tower!