Red Ribbon in Wine

"I'm not a vampire. I don't drink blood. I don't eat. I can just survive on this wine."

She's not a monster. Everyone calls her a 'vampire witch', but she doesn't understand. She didn't harm anyone. She wouldn't. It's not long until she finds suspicious dead body in the house and starts doubting the housekeeper.

So what has caused her love to leave? Where did he go?
And what is this red ribbon in the wine bottle? Isn't it what she gave him a week ago?
And why does she cry whenever she drinks the wine?
Why can't she swallow the last sip of wine?

What secrets are held in this house?