Bleh's Things

So basically its a master x servant type of shi. The master is rumored to cruel(?) But it turns out he's a good master, he just doesn't show himself. The mc was looking for a job and he end up working at the master's mansion. I think the master is not human and the "I need sex to survive" trope happened, I think.......
My minds a bit foggy about this story. I just randomly remembered this cause theres a manhwa with a similar concept ಥ_ಥ
Other things i can remember is:
- the master has black hair
- it was probably a manga
- theres this maid with a serious expression
- I think something happened with the masters mother and he has nightmares about


Pls pls pls Let me know if you know this or yknow anything that is remotely similar cause my minds foogy about this story