So take the anime/manga Devilman trope of people fearing, fear mongering, and hate of other people becoming demons. In this case, sinning and summoning them. Why did the writer(s) NOT make it an international level phenomenon but only in Seoul? Hard pill to swallow on the story given. The acting is good, tho. Not as good as Train to Busan or even Peninsula. Both of which I own on Bluray.