Every Day I Open the Shop, I Hear the Customers' Entrance BGM

After failing to seize the throne, the Second Prince flees to Jiangnan, where he lives in seclusion and opens an inn as its manager, determined to spend the rest of his life in peace. However, the Second Prince doesn't know that even if he names his place the Nameless Inn, instead of some famous chain like Dragon Gate Inn or Happy Inn, that won't keep the martial artists from constantly causing trouble and fighting there... But the Second Prince has a secret skill no one knows about: he can hear the BGM of characters when they make their entrance. So the prince's daily life goes from "Oh no, Big Brother and Third Brother are fighting again! Father, help!" to: [Hmm, this guest's entrance music is lilting, with a hint of menace. He's a steadfast hero. Just make sure to treat him carefully.] [Hmm, no one with BGM showed up today. What a lovely, ordinary day. Give the manager a raise.] [Ah! This person's background music is "Waiting a Thousand Years"! Level-one alert! Bring out the realgar wine!] [Holy crap, it's "Mighty and Majestic"! I haven't heard it in years. How nostalgic... Wait! Where did this demoness... demon come from? Throw him out!] Note: 1. The protagonist is the bottom. The CP is "Mighty and Majestic" (hey!), and it's a one-on-one pairing. 2. This blurb is from 2015... It's been so long... I've forgotten what I wanted to write... I've posted the chapters I had saved. There's a 99% chance this story will be abandoned! Don't wait for me!