Muzan Kibutsuji got sent to the timeline in millennium past the first person to be come a demon was given by a doctors who tried to cure his disease before he reached 20 years old will his past Muzan kibutsuji stop from drinking that medicine that turned him into a demon

Where am I? Well this place kinda familiar why am I at my old house? Muzan Kibutsuji heard cough aggressively in other room he open the door to see a past self coughing blood gripping his futon how pain he suffered