Traveling through time? You can reach another world as soon as you leave your house

I traveled through time, but the situation seemed a little special.
Lu Ren, who was just about to go out to buy a KFC, fell into deep thought as he looked at the princess sleeping on the bed in the cell in front of him.
Then, he subconsciously closed the door, was silent for a few seconds, and then opened it again. Looking at the Demon Ancestor and the Strongest Swordsman who were confronting each other in front of him, his eyes seemed a little empty.
So, he silently closed the door again, slapped himself a few times with a smile on his face to sober up, then slowly opened the door of his house again and silently made eye contact with the Demon Lord Milim who happened to be passing by.
"..."
this moment.
Lu Ren's pupils finally lost their luster. He looked down at the door handle he was holding tightly. He couldn't help but feel deeply confused about his life, because he couldn't understand -
"How the hell did I do that?"