The play uses the \”parallel world\” as the background. God releases the demons into the world, and the demons open the door to the parallel world. If another world has an \”I\” who lives better than \”I\”, will you change your life with him? Faced with these problems raised by the devil, the science-based Emperor Lee Kun who wants to close the door to the parallel world, and the liberal arts-based South Korean criminal policeman Jung Tae-il, who wants to guard love, deduce that they are sometimes excited and sometimes sour through cross-world mutual assistance, with different levels. Romance.