Whenever a human is born, they are automatically assigned a guardian angel. And Lucifer, not to be outdone, assigned the child a “guardian demon” as well. Twenty-four years ago, a baby girl was born and was assigned her guardians. Bright, energetic Hoseok as her angel. And Yoongi; a demon so apathetic that guiding her down a bad road was too much work for him. After Guardian Hoseok goes missing, Yoongi and his charge must team up to find their hope.