Billionaire Trapped Me In Mansion @LoveBuster_

I work for a cleaning service. One day, I had an accident at the house of a rude and mysterious billionaire – I broke an expensive vase. After that, he told me I had to stay and work for him until I was able to pay him back. I agreed, and despite the rocky start, I found myself being drawn to my employer's mysterious nature. During that time, I heard him scream in the middle of the night, which made me wonder what nightmares could torment such a man. Was I able to unlock the secrets of his past and get through to his heart...?