Kill Another Me

After staying up late for 30 consecutive days, I saw "me" eating late-night snacks on my sofa. Perfectly replicated acne marks, the same old sweatshirt, my favorite shrimp dumplings... When "he" asked "Back?" With a cat-and-mouse banter, I realized the terrifying truth of the "Mobius Project" - it was not a technical failure, but a success. The replacement has already begun. How do I kill my other self?