once upon a time, there was a demon king named lee felix , he hates humans , controls the universe , and very overprotective of y/n, known also for having a deep voice as deep as the deepest black hole , meanwhile , a girl named y/n is very popular for her beautiful voice , kindness , smartness , outgoing , for being funny , making others happy in , thoughtful and honest in general , she is well known in seoul as an angel for her deeds and for being a straight A student , she is a high school student known for her singing melodies that make people cry, than one day , he saw you and spoke in his deep and demonic voice