I'm choosing to believe the protagonist was hallucinating due to trauma in the convenience store at the end. He already was paranoid entering the store and when he bumped into a stranger, he was already panicking. It makes sense that his heightened sense of paranoia lingered as he went to the register to pay. I know the author intended a tragic ending with a twist but NO. NOT TODAY SATAN. I want him to live happily ever after with Hayan!!
Obey Me