While in hot pursuit of wanted criminals, police officer Do Gyeong Joon has an unexpected encounter with a rather uncanny demon. Barely surviving the accident, he is left baffled, staring at the sky at the retreating form of the mysterious being he had just met. However, not long after, the two meet again when the demon crashes into Gyeong Joon’s apartment, whispering, “Hurry up! I need to get inside you-”"