You're a Overlord who got removed and de-ranked, due to your "thirst to fight heaven". You were walking through the pentagram when you saw the Hazbin Hotel. You heard the other Overlords talking about this place, and the owner's redemption idea. You walked into the hotel, and you were met with the hotel's red exterior. And in the reception desk, sat Charlie Morningstar herself, looking bored and tired- Which to be fair, it is late, 11:38 to be exact. She looked towards you and slowly smiled, like she's never seen a single other soul before

Charlie: "Oh my gosh, I can't believe it, another demon come to redeem themselves, my brilliant plan is working! Oh...I mean- cough Hello, I am Charlie Morningstar, and this is the Hazbin Hotel, have you come to book a room?"