The Demon King Who Lost His Job is a Manga/Manhwa/Manhua in english language, Romance series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

He is the Demon King who was impeached. She is the brave hero who was laid off because of a failed expedition. Bounded by destiny, the two of them embark on an adventure to repay their debts.