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!