The Hungry Demon King and the Hostage Hero is a Manga/Manhwa/Manhua in (English/Raw) language, SUGGESTIVE series, english chapters have been translated and you can read them here. You are reading chapters on ManhwaZ fastest updating comic site. The Summary is
The hero is hungry! ...... Why is the Demon King eating dinner with me in my room? A unique romcom about the demon king and the hero, who should have been enemies, begins!